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Do You Know The 5 Things Oil Does Inside Your Engine?

Your oil system is critical lubrication for many components inside a piston engine, but you might be surprised what else it can do.....

1) Lubricates

First, oil lubricates engine components to prevent friction and wear.

2) Cools And Heats

Because of its high viscosity, oil regulates temperature well. It warms up and softens to allow free movement of components. Oil also regulates heat by absorbing of the energy generated by friction.


3) Seals

Due to its high viscosity, oil builds up in gaps and connection points, which essentially helps keep many engine components sealed.

J. Tewell

4) Actuates

As is the case with a constant speed propeller, oil can actuate systems. In this case, it changes the pitch of the propeller.

5) Cleans

Notice how old oil comes out dark and dirty? It traps contaminants in the engine. When you change your oil, you're also cleaning your engine.


Have you ever wondered why oil is streaking down your cowling? Click here to find out why.

Swayne Martin

Swayne is an editor at Boldmethod, certified flight instructor, and an Embraer 145 First Officer for a regional airline. He graduated as an aviation major from the University of North Dakota in 2018, holds a PIC Type Rating for Cessna Citation Jets (CE-525), and is a former pilot for Mokulele Airlines. He's the author of articles, quizzes and lists on Boldmethod every week. You can reach Swayne at, and follow his flying adventures on his YouTube Channel.

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