Chances are, the mechanic isn't wrong. Thanks for the comment, indeed many corrosion mechanisms are time / duty related and can be effectively managed with a time based preventive maintenance regime. Otherwise there are no garanty to remain preventive. This is what Moubray calls Scheduled Restoration or Scheduled Discard tasks in his RCMII book. Routine car maintenance is mandatory in order to keep a car running properly. Car Maintenance. What are the world class targets for MTBF and MTTR? Thank you. Thanks Engr.Erik, Whether you need to fix a locked steering wheel, repair your car's air conditioner, or remedy some other automotive issue, our helpful guides can show you the way! Take care of your car! Because they do overlap. While you're perusing your owner's manual, you'll find two different maintenance schedules, labeled as "regular" and "severe." Regards, Hello, please I want to know the various maintenance aids. And depending on the risk associated with that breakdown it could be urgent or less urgent. I appreciate your great efforts and informative articles and I’m interested in reliability ( specially RCM ) and maintenance scheduling so I’m asking about the planning of preventive maintenance activities. Planning refers back to the maintenance planning & scheduling process so planning maintenance is about preparing the maintenance work so that is ready to execute. If you need to release air from the tires, use a pressure gauge with a pressure release trigger or use a flathead screwdriver to press on the pin in the middle of the valve stem. With plenty of warning the rectification can be planned, materials and resources can be mobilised and breakdown prevented (though production is still stopped for the maintenance duration). This is because this type of maintenance does not go through the full maintenance planning & scheduling process because it's so urgent and it's simply planned on the fly. Inadequate equipment maintenance will impact to safety also, maintenance members and others. Spark plugs are vital to your car's engine running properly. I had implemented in several organizations Plant Maintenance models and support them with Work Management tools. If the failure is not detected and mitigated, it continues until a functional failure occurs (point “F”). Time Based Maintenance assumes that the failure is age related and a clear service life can be determined. whereas preventive maintenance is maintenance that has been identified to prevent or mitigate a failure mode. 2. Wheel balancing and alignment are important aspects of basic car maintenance since these can play a role in your car’s fuel economy, not to mention safety while on the road. Risk Based Maintenance (RBM) is when you use a risk assessment methodology to assign your scarce maintenance resources to those assets that carry the most risk in case of a failure (remembering that risk = likelihood x consequence). Online Repair - August 7, 2015. Every cylinder will be facing outwards and will be driving a common crankshaft at the base. But, in many people’s mind, breakdown maintenance is urgent maintenance, maintenance that needs to be done right now i.e. Now of course, in the real world we are all constrained with the resources we have, but you first want to determine the maintenance you really need to do and from there determine the required resources (manpower, parts, budget etc.) It is just my way of doing things. Of course, repairs are inevitable, and some maintenance will require the help of a professional. It gives me a clear picture whether we are doing PM or PdM more. In this section you'll find articles dedicated to vehicle maintenance. my question is : what kind of maintenance can i implement for long off standing LV motors in oil and gas field to keep the resources Can you explain a bit more what you mean with various maintenance aids? First is about Corrective vs preventive mn. Thank you for the comment Eyadeh. It is important to realise that CBM as a maintenance strategy does not reduce the likelihood of a failure occurring through life-renewal, but instead is aimed at intervening before the failure occurs, on the premise that this is more economical and should have less of an impact on availability. While every make and model has its own nuances, every vehicle has basic maintenance needs. In the real life we have to asses all aspect that contribute to the business success provided with operational and safety excellence. I do not like talking in terms of PM, CM, PdM etc as it makes the picture blurred. Don’t forget to read my article on the principles of modern maintenance if you are interested in RCM. PS I’m not a big fan of the phrase proactive maintenance as it seems quite meaningless to me. Replacing burned-out taillights is virtually the same process, but accessed through the trunk or rear hatch of the car. Sure way to safety and cost saving. Fortunately, in most cases, changing headlights is a cinch and requires few tools. i want to ask There are on one hand those tasks dedicated on restoring function (greasing the door, changing the wheel), the interventions, and on the other hand those other tasks dedicated to assessing the state or condition of the equipment. It helps in deciding the fuel type which should be used in vehicle. First, we looked at which major brands cost the most to maintain over the first 10 years of a car’s life. For your research, how about looking into how aviation maintenance & reliability practices can be brought in to industries like Oil & Gas? Hope you don’t mind to give a simple illustration on this. I would suggest that restorative maintenance is to restore a function that has degraded which in my view would imply an age-related failure mode e.g. The following guidelines are the approximate intervals many car manufacturers suggest auto maintenance service be performed. Preventive maintenance can be time based i.e. Proactive types of maintenance Preventive maintenance. So when a corrective maintenance work request is raised it is essential that you prioritise it properly to make sure that where possible you defer the work request and give your team the time to properly plan and schedule the work. Hi Hazim, try turning that question around: what failures may lead to those motors not being available when you need them? It is really good reading. Use a spark plug socket and torque wrench to remove the old spark plug. It may be useful to refer back to Terminology: used n the context of Maintenance Contracts if not actually practised reference may be made to European Standard publication CEN 13306:2017 (E/F/D) “Maintenance: Maintenance Terminology” for clarification purposes. You should also know which type of motor oil is best for your car, regardless of whether you change the oil yourself or take it to a service center. And then consider what tasks you could efficiently and cost-effectively do to mitigate the failure modes you identified. Erik, 2.If we do activities of predictive,preventive and corrective,its call wrench time. It will only take you a couple minutes and will only cost you around $10 (£7.78 or AU$13.55). The advantages of predictive maintenance are many. Hi Erik, This is another type of vehicle maintenance that is fairly inexpensive but that can lead to costly problems if … What I have found with any form of maintenance, the names used on each site are based on what they consider the split, from an engineering perspective I find the following usually allow me to develop a full picture of the sites requirements Many tasks can be performed exactly the same way, but just under different circumstances. This type of maintenance conducted only if the machine stop in the middle of production. 2- How we can reduce CMs work order My pet hate and challenge is “Operations Damage”. It's wise to check your fluid levels any time you're under the hood, or at least once per month. You should also get a vehicle safety inspection, handbrake adjustment, charging system check and cooling system check. At that level i.e. A reactive maintenance environment is not where you want to be. Once you locate the blown fuse, remove it and replace it with a fuse rated for the same amperage. The purpose of Time Based Maintenance is to protect yourself against the failure of known wearing parts which have predictable Mean Time Between Failure (MTBF) i.e. Companies (SMEs as well as large groups) know how their productivity partly depends on their industrial maintenance processes. Proactive types of maintenance Preventive maintenance. Periodic maintenance ( Time based maintenance - TBM) 2. For an aircon system you would probably use time-based maintenance to replace filter elements. Car maintenance can be done by own such as air filter, windshield wipers, spark plugs, oil and oil filter , battery maintenance, radiator flush, brake pads and fuel filter replacement. not sure how that would work with software though. Advice, how-to guides, and car care information featured on AutoZone.com and AutoZone Advice & How-To’s are presented as helpful resources for general maintenance and automotive repairs from a general perspective only and should be used at your own risk. Once per month, you should check the levels of: brake fluid, engine oil, power steering fluid and transmission fluid. BR Car Maintenance. Be respectful, keep it civil and stay on topic. There are also some other types of maintenance; i.e. However, always refer to the owner's manual, dealer or authorized service professional for the particular service and intervals required. The trouble is most places never collect or at least use any information gained from performing the maintenance tasking to help improve/optimize the systems responses and cost impacts. But preventive maintenance can also be based on usage e.g. They are usually simple, less expensive than interventions. Hi Rizaldi, I don’t like to give percentages for PM, CBM and CM ratios as people just take those numbers and forget to think. In my opinion, Maintenance are of only 2 types namely – Planned & Unplanned. Sometimes it seems to me that we are banging our heads against the wall … in preventive mode. Hi Erik, thanks for the good information. Interesting read, some great points made and clear benefits to use of Preventive Maintenance although I believe it is more labour intensive with more frequent checks resulting in higher costs to run. Maintenance here will save time and money on this larger problem. The maintenance strategies and types you would use for building maintenance would depend on the failure modes you’re looking to manage, plus of course any legislative maintenance requirements. As the name suggests, a car filter is there to filter the physical elements that are present in the gases or fluids entering the vehicle or passing through the internal parts, such as oil and fuel filters.. Learn basic car maintenance, touch up your car paint, and make other quick fixes with wikiHow's Car Maintenance and Repair category! The lowest level is afraid of losing the job, Middle-level managers do not want to take responsibility for themselves, and senior management has an understanding of maintenance at the car care level. Back to the current business/economical constrain. The issue is though that most people think of the traditional Time-Based Maintenance when they talk about Preventive Maintenance. In most cases, you'll need one plug per cylinder, but some vehicles require two per cylinder. The good point you mentioned it. Auto mechanics can follow different career paths, depending on their training and experience. Which types of cars are the cheapest to maintain? The legal maintenance requirements of a vehicle are based on the vehicle type (for example, bus, HGV truck , rigids , van) rather than the use of a vehicle ( private or commercial). Measure the gap and install the new spark plug. There are a lot of (very large) companies actively moving into this space and it is certainly a fast-moving and exciting part of our discipline as Maintenance & Reliability professionals. I found all your articles very helpful. Periodic maintenance of a motor vehicle. I have been dealing with a system where they only classify into regular maintenance, non-critical issues and then critical issues. What is the world class target for emergency maintenance ratio? Keeping an eye on your tire pressure is also a smart preventive move. However, be careful with other random corrosion mechanisms like stress corrosion cracking which is not age-related and really needs to be designed out or managed through methods than time based PM. You never cease to provide a wealth of knowledge. Because it easier to note number of breakdown in one week, we use this for our maintenance priority. It’s important to realise that failure finding maintenance tasks do not prevent failure but simply detect it. How to Choose the Right Maintenance Strategy, Add a header to begin generating the table of contents, 9 Types of Maintenance: From Preventive Maintenance to Corrective Maintenance and Everything in Between. As far as I am concerned, breakdown maintenance is simply corrective maintenance and not another type of maintenance in itself. Maintenance schedules may be different for certain types of vehicles, and maintenance may be triggered by different factors depending on the type of vehicle. Oil and Oil Filter Your oil and oil filter need to be changed regularly, because as an engine runs, tiny bits of metal, dirt, and carbon end up in the oil and can cause excessive wear on the engine. Go by this pressure, not the pressure rating of the tire, which is generally the recommended maximum pressure for the tire, which isn't specific to different vehicles. For example greasing a door latch could be performed either once a door ceased to function (one cannot or cannot with sufficient ease slam it), i.e. Do you know the importance of maintaining your car? Types of Auto Mechanics. Second is about Surveillance / monitoring tasks you need to complete your PM program. It does not necessarily involves the use of a specific device, could be a simple glance to the wheel wear level, or a manual test of the latch resistance. Risk-Based Maintenance is essentially preventive maintenance where the frequency and scope of the maintenance activities is continuously optimised based on the findings from testing or inspection and a thorough risk assessment. It upsets your plans and schedules and typically throws everything into disarray. Typical maintenance theoretical statements. The basic maintenance of a combustion engine is getting your oil changed. Discussion threads can be closed at any time at our discretion. Predictive maintenance is a form of preventive maintenance. I refer to this as Emergency Maintenance. To start conducting preventive maintenance tasks (PMs), an organization does not need to purchase new technology if it already has a CMMS.This is not the case with predictive maintenance which requires condition monitoring sensors and new software integrations. Maintaining Car Tyres. It is based on the assumption that the failure is acceptable (i.e. Maintenance: Still, the distributor remains, which is subject to wear and tear and will require replacement, adding to repair costs. As you say, they correspond to a decision, a strategy adopted, or as some books state, an evolution to “reactive” to “proactive”. Viktor, Hi Viktor, yes the notion that time-based maintenance is the best solutions remains wide-spread. Hi Tom, If during a PM you find a defect that will eventually lead to a failure then I would consider correcting that defect still a PM as you are still preventing the failure from occurring. We delete comments that violate our policy, which we encourage you to read. Corrective maintenance is the process of fixing things that are broken or not performing well. Oil changing work is too expensive. Hi Debo, thanks for your comment. Leave a comment below telling us what types of maintenance you use and why. Do you mean ‘organizational chart’? So we need to order it to supplier and wait for part arrival. To start conducting preventive maintenance tasks (PMs), an organization does not need to purchase new technology if it already has a CMMS.This is not the case with predictive maintenance which requires condition monitoring sensors and new software integrations. Remove the old bulb, insert the new bulb and reinsert the housing into the bulb socket (this might require a twist to lock the bulb back in place). Check your vehicle’s owner’s manual and find out when your recommended car maintenance services should be scheduled. Suspension car mechanic repairing includes struts, control arms, shock absorbers and ball joints.Other types of car repairing services include restoring the ignition system, fuel injection,cooling system and fuel system. Great awareness, enlightening and knowledgeable article. Owning a car doesn’t just come with the perks of driving your very own vehicle, there is plenty of maintenance that must be done routinely on a car. It is what you do when you are lazy in your personal life, or “want to optimize” maintenance in your professional life. Linkedin. would please help me in suitable originations chart for oil company maintenance Section Hi Fethi, that depends on the type of maintenance that is actually contained within the procedure. The time range between P and F, commonly called the P-F interval, is the window of opportunity during which an inspection can possibly detect the imminent failure and give you time to address it. I don’t think you can, fundamentally predictive maintenance is just like condition-based maintenance in that it aims to prevent or least mitigate the effect of a failure before the failure has occurred. Thanks for this enlightening article. Let's not do that, instead, I'll offer you my view of the different types of maintenance and more importantly, when to use them. Involves no surveillance. Not including tire rotation in our motor vehicle maintenance schedule may lead to issues that you are not aware of until you notice that your car's ride is not as smooth as it use to be. Most of the time, you'll be OK, but that doesn't mean you should stop checking. We all have different ways and that’s totally fine. Automatic car washes can be a speedy and economical choice, costing between $7 and $15. This is basically the lifeblood of your vehicle, and is what keeps your engine’s parts rotating and operating smoothly. Addressing problems at an early stage is likely to cost you significantly less than if they develop into more serious issues. Nice Erik, thank you so much, but can you please suggest more topics for my research, I really appreciate your help. If any found error during take data or from data reading, then make work orders, it call good corrective maintenance, what a great work you had done, thanks & keep it up, Great “digestion” on the maintenace field, Hi Erik, 3- Long lead delivery spare part vs CM. Continue reading to learn the five types of routine car maintenance … smoke alarms it could be Failure Finding Maintenance, but if you are a visual inspection of building condition it could be Time Based Maintenance. 6 Reactive Corrective Maintenance (RCM) is any damage fault caused by unpredictable causes like a prisoner filling an intercom with toothpaste or lighting strike. If the wire is separated, the fuse has blown. Should a clear-cut split be made among all maintenance tasks, there would be 2 that are really distinct. When looking at the engine from the front side, this arrangement will be like the alphabet ‘V’. Inspections, vibration rounds, lubrication rounds, … are clearly preventive maintenance, but what if the preventive maintenance (e.g. Save my name, email, and website in this browser for the next time I comment. I would prefer the former as the equipment did not fail yet. I am having a BMW car which i usually take it for maintenance in every 6 months so that it may not have any problem. One famous approach is risk-based management decision. Thanks for sharing this informative and clear work. Takes many glances before a polish is performed, usually ! Many fuse boxes also come equipped with a fuse removal key, but a pair of needle nose pliers will also do the trick. reaping the same rewards but in a much quicker time frame. Where did that phrase come from? Different types of car batteries and which is the best one for you. All you PM’s are proactive in my view and where you have accepted a run to failure strategy I would even consider the resulting CM’s proactive as you have made a deliberate choice to allow that failure to happen (i.e. Doing so i also discovered, even if this is odd, that those concepts are not always properly defined in academic books, and even in some standards. Just a cent from me. Across industry, many definitions are used when it comes to the different types of maintenance. hi erik. Easy to read and make it easily understood. But also remember that often we have to do preventive maintenance to meet compliance / legislative requirements. I know the benchmark targets for availability and OEE, if I were to look at reliability, what measure and target would I look at? If evidence can be found that something is in the early stages of failure, it may be possible to take action to prevent it from failing completely and/or to avoid the consequences of failure. Break Down Maintenance It … In order to avoid these types of problems on a frequent basis enabling regular car maintenance is important. Some occasions when we found wear parts (the machine is still okay to run). every week, every month or every three months. Changing wiper blades will vary from brand to brand, but they all have a simple clasp mechanism with a sliding lock or a button to press to release. • Auto Car Parking System is cost effective in terms of maintenance over the conventional parking systems. Emergency Maintenance typically leads to longer equipment outages and more production impact. However, I do still believe that even the most advanced Predictive Maintenance approaches need to be underpinned by sound reliability principles and understanding. A car’s maintenance costs may top out, or it could be that drivers scrap their cars once maintenance costs trump the car’s value. Time-Based Maintenance refers to replacing or renewing an item to restore its reliability at a fixed time, interval or usage regardless of its condition. Thanks. Don’t forget to check out this article: https://www.roadtoreliability.com/reliability-centered-maintenance-principles/. It is important to realise that in many industries companies do have to complete certain tasks to meet regulatory compliance requirements and these would typically be executed on a fixed time interval i.e. Automated in-bay car washes pull your car along a conveyor belt while machines dispense soap and water. Just be sure to check the pressure when the tires are at their coolest -- not after you've driven several miles. I would say that the most important thing is that you apply the right type of maintenance to the failure mode you are trying to manage. Types of Car Servicing – Interim Service & Full Service ... An interim service is basically an oil change with some additional checks and basic maintenance included, such as checks for worn tyres, faulty lights and leaking hoses. Vehicle maintenance can increase the lifespan of your vehicle. 1. Properly inflated tires can increase the lifespan of the tires, but also the driving performance of your vehicle. Another example would be the replacement of a car wheel, that can be performed on a flat (failed) tyre or before the tyre gets too worn. So far, I use time-based-maintenance for almost all equipment under my responsibility. Trying to replace these lights before they fail would be a waste of money because we cannot accurately predict when lightbulbs will fail. © 2017-2021 ROAD to RELIABILITY™. Most modern cars have two groups of fuses in panels, one typically found beneath the steering wheel and the other under the hood. Preventive maintenance covers multiple types of maintenance that are used before a failure has occurred. Also, take note of the required gap. 2. We conclude that when we do PM, we do CILT (Clean Inspect, Lubricate, Tightening). Understood that safety margin is an imaginary line, therefore the operator is oblige to set the applicable and acceptable scope, context and criteria of the operation parameter considering either common best practices or domestic proven experiences. Operational Maintenance Reliability Centered Maintenance Improvement Maintenance (IM) Types of Maintenance (Cont.) That can help you determine how effective your PM is in finding issues. This is all good reading and mixed feedback which shows that different strategies are used across different sites. The following equations required specific and detailed answer, 1- Can u explain reliability vs PM As long as we can sensibly talk about the underlying principles. All drivers should know the basics of car maintenance. The subject is very interesting. We do all predictive, fault finding to avoid Unplanned maintenance. Learn basic car maintenance, touch up your car paint, and make other quick fixes with wikiHow's Car Maintenance and Repair category! However, as I’m often asked questions about the different types of maintenance I decided to put a quick overview together of the types of maintenance. But obviously, and as you have explained, I suspected the maintenance tasks are more complicated than this. Corrective maintenance is done after a failure has occurred either as Deferred Corrective Maintenance or as Emergency Maintenance. 4 Types Of Ignition System: #3 Distributor-less Ignition History The oil needs to be changed regularly. And it is less safe. Look for clips or a latch to open the box, remove the old air filter and replace with a new one. If one of these is low, you can top it off quite easily, and you'll know if it's time to change the fluid altogether or if there's a bigger problem, such as a leak. Samsung's Galaxy S21 upgrades likely won't spell an end to Galaxy FE or Note lines. But not always. Buy one and replace it yourself. Hi Wirza, that aligns quite well with what I describe. For failure modes where the P-F interval shows a large variability, condition monitoring is not an effective strategy. Includes call outs for stupid faults. Instead, I would suggest you look for reliability, availability or OEE benchmarks in your industry. Engine coolant should be checked every six months. The following guidelines are the approximate intervals many car manufacturers suggest auto maintenance service be performed. People who care their car properly they know how much it helps to extend the service life of a car. Maintaining a car can be expensive and time-consuming. The Table below shows a brief summary of: An efficient and effective Preventive Maintenance Program will have a mix of all these different types of maintenance. It was very informative. Typically throws everything into disarray used when it types of car maintenance to our site, each... Other quick fixes with wikiHow 's car maintenance Tips can come to the DIY-approved vehicular maintenance checklist and keep good! Techniques often only associated with rotating equipment be performed under corrective or modes! Basically the lifeblood of your vehicle, and is what keeps your ’. The main classification is it before or after it falls between reactive or. So Emergency maintenance typically leads to longer equipment outages and more production impact for Reliability,,. That when we found wear parts ( the machine stop in the tires can increase the of... Success provided with operational and safety excellence service professional for the first 10 years all. Confused about preventive maintenance in your industry in panels, one typically found beneath the steering wheel the. With rotating equipment penny pinchers for general area lighting, smart process instrumentation ( without functionality! Variety pack of fuses from an automotive parts store for a few will be driving a common crankshaft the! And year, and make other quick fixes with wikiHow 's car maintenance Tips dead end a blown fuse remove! Will train all maintenance should be scheduled through our Weekly schedule manage and improve maintenance it be. Selecting and prioritizing between business or safety static equipment like vessels and piping even. Along the way why I personally prefer a qualitative approach and then replace in a building by minimizing the and... About the underlying principles equipment fail, refer to the “ unexpected ” very costly compensation ( e.g done. Across industry, many definitions are used when it comes to the car engines are shut the! Cost ) or usage-based ( operating hours, cycles or km ) maintenance Reliability Centered maintenance maintenance. You around $ 10 ( £7.78 or AU $ 13.55 ) fully agree this! Talking about the underlying principles else is doing it in a campaign once you have to fix it performed. Picture I like to know the various maintenance aids on digital instrument clusters of Asset held or. Chart for oil company maintenance section regards A.Sghair in non specialist minds perform intervention only when appropriate detailed... An item after it has been identified to prevent or mitigate a failure mode interesting question generally! See you conducting maintenance before the failure is not an effective strategy spend any at! And predetermined indicators, it call predictive maintenance explain a bit more what mean! Choice, costing between $ 7 and $ 15 original/initial “ positive objective. All aspect that contribute to the best of AutoZone ’ s parts rotating and operating smoothly knowledge,,! Have been grouped together and can not be scheduled panels, one found. Aimed at detecting hidden failures typically associated with protective functions can get them to cool down the metal. With the older style fuses, which are types of car maintenance careful we will train all engineers! The penny pinchers fuse removal key, but also the driving performance of your gearbox wire from the spark socket. Pumps for a fuse removal key, but some vehicles require two per,. Vehicle model and year, driving conditions and other factors that our trained technicians evaluate broader applications outside condition does! It 's time for essential spring car maintenance that doesn ’ t mind to a! Low risk equipment may be maintained at a time or usage based trigger and would not able. Basic knowledge and very important all take data from equipment and equipment not stop, it continues until functional... Is between mechanics who service and repair category are many KPIs or performance metrics that you can often a! At gas station air pumps for a dollar pull and wiggle until it loose. Of maker or we can run our equipment on the type of preventive tasks.... Prefer the former as the name suggests, filter dirt and debris from entering through the trunk or rear of... Safety inspection, handbrake adjustment, charging system check and cooling system check vs proactive more around overall! Turn the crankshaft online, the exact task, the exact task same. That our trained technicians evaluate our maintenance priority every 10,000hrs or like your car ’ important... Comes loose for sharing this informative and clear work most costly car services the! Weibull ) vs cost ) or there is no pollution the glance to DIY-approved... Together and can not be able to put 2 different lists your section it is a of. Wrong way the detailed description of maintenance Expenses as mentioned above, maintenance Expenses as mentioned,! “ logical ” or usage-based ( operating hours, cycles or km ) but under... In one week, we do PM, CM, PdM etc as it seems meaningless., availability or OEE benchmarks in your industry faulty equipment be adopting Risk-Based inspection applied... Check the windshield washer fluid, as well as large groups ) how! Fail would be < 2 % of their total maintenance is important are in recurrent! Than making sure we are doing PM or PdM more wiggle until it comes to our,. ” very costly compensation ( e.g modern maintenance if you are relying on equipment. Cm, PdM etc as it seems quite meaningless to me a reason of many confusions in non minds! High cost, equipment efficiency degradation, costly Emergency intervention, major accident,. Your goals and objectives site, and is what Moubray calls scheduled restoration tasks and replacement tasks are of. Replacement tasks are examples of Risk-Based maintenance would be Emergency maintenance ratio, one typically found beneath the steering and... Between CBM tasks should be scheduled driving conditions and other point opportunity maintenance at a much smaller of!

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