Yanmar Diesel Engine Life Expectancy and Durability

Your average diesel engine should last around 5,000 hours. However, one of Yanmar’s signature diesel engines, if properly maintained and taken care of, can last anywhere from 8,000 hours to 10,000 hours.

As a general rule of thumb, diesel engines are far more durable than standard gasoline engines. Even still, they need to be taken care of if you want your engine to last for as long as possible. 

In this guide, we are going to teach you how to perform proper diesel engine maintenance so that you can squeeze every last hour out of its life cycle.

Recommended Read Why You Need to Upgrade to a Tier 4 Yanmar Diesel Engine

Diesel Engine Maintenance Tips

Diesel engines are excellent because of their lower emissions and greater fuel economy, and they also require less maintenance than your typical gasoline engine. However, this does not mean that you can skip maintenance altogether.


A well-maintained diesel engine will last several thousand hours longer than an engine that is not maintained at all. If you follow the following tips, you can squeeze as many hours out of your Yanmar diesel engine as possible.

  • Clean your engine
  • Replace your fuel filters
  • Keep an eye on the radiator
  • Replace your air filter
  • Check your engine’s coolant
  • Perform oil changes
  • Keep an eye on the exhaust

Of course, every engine is different. Be sure to consult your owner’s manual for specific information about your diesel engine.

Clean your engine

Engines, diesel-fueled or otherwise, get extremely dirty after prolonged use, especially if they are being used to power a truck that is out on the roads for a long period of time.

Your engine can become covered in all kinds of dirt, oil, soot, and grime. Make sure you clean your engine on a regular basis. Excessive dirt can obscure any oil leaks your engine may have. If your engine is kept clean, you can identify an oil leak very easily.

Additionally, road salt can cause your engine to rust prematurely.

Replace your fuel filters

Your engine’s fuel filters should be replaced on a consistent basis. If your engine is powering a diesel truck or another road diesel vehicle, this should occur every 10,000 to 15,000 miles or so.

Newer models of diesel engines often have two fuel filters. These should be replaced at the same time if possible.

Keep an eye on the radiator

Your engine’s radiator acts as a cooling system. This is especially important for diesel engines, as they run much hotter than standard gasoline engines. If your engine overheats, this can lead to warped components and even engine failure.

Every so often (the specific amount of time depends on your engine and its application), you should run a cleaning fluid through your radiator and fill it up with new antifreeze.

If you notice orange or green fluids leaking from your vehicle, you should have the radiator checked out by a professional immediately.

Take a look at our selection of Yanmar diesel engines!

Replace your air filter

If your diesel engine’s air filter gets too dirty, your engine will use up more fuel to run than it normally should. For diesel trucks and other diesel vehicles, the air filter should be replaced around every 12,000 miles.

Check your engine’s coolant

Over time, engine coolant can become acidic, which can cause your diesel engine to rot from the inside. Make sure your coolant is topped off on a regular basis. You should completely replace it based on the instructions in your owner’s manual.

Perform regular oil changes

Oil is used to keep your engine lubricated, preventing the different components from grinding against each other. Without proper lubrication, your engine will become damaged very quickly. Check your oil on a regular basis and top it off if needed.

For vehicle diesel engines, you should perform an oil change every 5,000 miles or have a professional change it for you. If your diesel engine is being used for a heavy-duty application, you may want to have the oil changed more frequently.

Keep an eye on the exhaust

Pay attention to your diesel particulate filter (DPF) regeneration. This is when particulates heat up, combust, and turn into ash and carbon dioxide. If you noticed that DPF regeneration is occurring frequently, you may want to have your exhaust system looked at.

Frequently clean your DPF to make sure that an inordinate amount of ash is not gathering in the system.

You Can Rely on C&B Equipment for Any Diesel Engine-Related Needs!

C&B Equipment is a reliable distributor of Yanmar diesel engines, and we are more than qualified to perform any kind of maintenance and repairs on your engine. This includes regular oil changes, component replacement, and anything else you can think of.

Whether your engine has been running for 1,500 hours or 8,000 hours, we can help you extend its lifespan even further with one of our preventative maintenance programs. If you’re in the market for a new engine altogether, look no further than our selection of Yanmar diesel engines.

In addition to engines, we also offer several other types of industrial equipment, including blowers, air compressors, and centrifugal pumps.

Take a look at our preventative maintenance programs!


Take a look at our selection of Yanmar diesel engines!

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