Engine Oil

Benefits of an Engine Flush

Many oil-change chains offer additional services, such as transmission fluid modifications and air conditioning maintenance. An engine flush is one of the recommended services that an oil change technician may recommend next time you visit. It flushes out the gunk from your engine.

The engine is then turned on, and the chemicals are added. The chemicals are then drained just as an oil change would. An engine flush is usually performed after the old oil has been removed and before the new oil is poured in.

While it is important to keep your vehicle clean, many manufacturers recommend against flushing the engine. Chris Martin, Honda goes, stated, “Our engineers have performed extensive tests to create specialized maintenance products, service standards, that support the performance, longevity, and safety of Honda vehicles. These standards do not include engine flushing.” Engineers from GM stated that engine oil flushes were not recommended. You don’t need to flush the engine if the oil changes according to schedule.

While there may be occasions when an engine flush may be necessary, it is important to remember that modern engine technology has advanced to the point where many vehicles don’t require this procedure and may even be damaged by the process.

Let’s not forget that engine flushes have five benefits.


  1. Remove Deposit Build-Up
  2. Clean Your Car
  3. Keep New Oil Clean
  4. Fix the Filter Issues
  5. Clean Engine Parts

Removing Deposit Build-Up

Sometimes engine oil cannot perform its job properly because of how we drive. A few short trips and much stop-and-go driving can cause oil particles to build up in the engine. These deposits can restrict oil flow.

An engine flush can remove those deposits and open oil passages that have been clogged with gunk. The engine will run more efficiently if the deposits are removed, and oil can flow freely.

Clean Your Car

Although most cars are maintained and driven regularly, an engine flush is unnecessary in all cases.

Cars without a documented maintenance history. An engine flush, followed by a few quarts of oil, might be a good idea.

Cars that have had recent engine work. An engine flush can be performed if your car has done any engine work.

Cars that have a long time between oil changes. You also know the car’s service history. Dirty oil will only get dirtier, so there is almost a certain buildup. A car’s engine flush can prolong its life.

Keep your new oil clean

An engine flush can help you keep your oil clean, especially if your car’s history is visible (or not) on the previous page. They are often done together: First, the oil flush to remove old oil deposits and then the oil change to keep your engine in top shape.

If not flushed from the engine, the new oil will only pick up old deposits and sludge. It will then circulate through the engine. The new oil will soon be just as filthy as the old. An engine flush can extend the time between an oil change, particularly if maintenance has not been done properly.

Clean up what the filter has left undone

Most oil filters remove particles smaller than 25 microns (or about 1/1000th inch). However, there are still particles in your car’s engine oil that can harm your system. Even tiny bits can cause wear over time. They can also work together to form sludge or deposits.

These particles can become too large to be flushed out with oil. However, the engine flush chemicals can stop further wear and allow the oil to perform its job properly.

Clean Engine Parts

The engine parts can become clogged up if the oils get too thick. The engine flush will remove the gunk and keep the parts running smoothly. This can improve the engine’s efficiency, which will bring the car’s power and fuel economy closer than they had before it left the showroom.

However, in very old cars, the engine flush may clean these piston rings and valves too well. The gunk can sometimes act as a spackle on non-metallic parts such as rubber seals prone to cracking from age. Those cracks can be revealed by cleaning out gunk.

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