Skip the auto shop - Our mechanics make house calls

Q: Cleaning two-stroke and four-stroke engines

asked by on

Please explain 2-stroke and 4-stroke engine in reference to fuel cleaners in your car.

A: 2-stroke engines don’t have an oil sump. Th...

2-stroke engines don’t have an oil sump. There is no actual oil in the engine to lubricate it. So you have to mix oil with gasoline. Usually, it is in a 40:1 ratio, with 40 parts gasoline and one part oil. Then when the gasoline gets inside of the car, it’s oily. So it gets on the metal parts and lubricates them. So, the cleaner made for 2-stroke engine has to be a very strong cleaner that works with burning, when the engine oil and gasolines mix.

A 4-stroke engine, on the other hand, has the oil is in a sump and is pumped through the engine to lubricate it. So the gasoline is pure gasoline and there is no oil mixed with it. So, the oil and the gas are not supposed to mix in the engine like that. So they need different kind of cleaner.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: How do I use the windshield washer?

The windshield washer provides extra visibility by spraying the windshield with a soapy mixture, and then washing it away. To use the washer, pull the wiper lever (on the right side of the steering column) towards you, and hold it...

Q: When the ignition switch is left on ACC for a while, the car won't start

This is not an uncommon issue. Listening to the radio for 25 minutes with the car off is not a problem normally. But in this case, the most likely cause of this is either the ignition switch or the battery...

Q: Recommendation and information on seal conditioners and synthetic oils

No, not to my knowledge. The problem with all kinds of sealers and engine oils is that they have all kinds of additives but no one ever tells you what the exact ones are. So you really can't compare. The...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.