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Have a Diesel Engine? Here are 6 Key Maintenance Tips

car engine

Diesel engines are reliable and efficient, but like any machine, they require regular maintenance to keep them running smoothly. Neglecting your diesel engine can lead to costly repairs down the road. 

What Is a Diesel Engine?

Diesel engines are internal combustion engines that use compression to ignite the fuel rather than a spark plug. Diesel engines are typically more efficient than gasoline engines and can run on various fuels, including biodiesel.

Diesel engines are found in various applications, including cars, trucks, buses, trains, construction equipment, and generators.

To keep your engine in top condition, follow these six maintenance tips:

1. Change the Oil and Filter Regularly

The oil is the lifeblood of your diesel engine, so it’s important to change it regularly. Depending on your engine’s make and model, you should change the oil every 3,000 to 5,000 miles or every 3 to 6 months, whichever comes first.

When changing your oil, be sure to also replace the filter. A clogged filter can restrict oil flow to the engine, causing premature wear.

2. Check the Coolant Level and Top Off as Needed

The coolant helps keep your engine running at the proper temperature. Over time, the coolant can become contaminated and needs to be replaced.

To check the coolant level, remove the radiator cap and look inside. The coolant should be at the “full” line on the neck of the radiator. If it’s low, add more coolant until it reaches the proper level.

3. Test the Battery and Charging System Regularly

The battery provides power to start the engine and runs the electrical accessories. To keep it in top condition, test the battery and charging system regularly.

If the battery is over three years old, it’s a good idea to replace it. A new battery will last longer and provide more power to start the engine.

4. Inspect the Belts and Hoses for Signs of Wear

The belts and hoses are essential for keeping the engine running smoothly. Over time, they can become brittle and crack, so it’s important to inspect them regularly for signs of wear.

If you see any cracks or splits, replace the belt or hose as soon as possible.

5. Keep an Eye on the Exhaust System for Leaks

The final maintenance tip for diesel engines is to keep an eye on the exhaust system for leaks. A leaking exhaust can be dangerous and can also cause your engine to run less efficiently. If you notice any leaks, have them repaired as soon as possible.

6. Have the Engine Serviced Regularly 

A trained technician can check for potential problems and perform preventive maintenance. Service intervals vary depending on the engine, but most engines should be serviced every 12,000 miles or every 12 months, whichever comes first.

Following these maintenance tips will help keep your diesel engine running smoothly for years to come.


The most important maintenance tips for diesel engines are to regularly check the oil level and quality, as well as the coolant level and concentration. It’s also important to change the fuel filter and air filter as recommended by the manufacturer. In addition, diesel engines should be given a tune-up every few years to keep them running smoothly.

Automed Car Care focuses on offering Japanese and American vehicles the repair they need to stay in good shape and function at their best. If you are looking for a Japanese auto repair specialist and more, get in touch with us today!

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