The build-up of oil in an engine. A gel-like substance that sticks to your engine parts and blocks oil passages preventing the normal flow of oil through your engine.
Out of round:
When a tyres condition is too far out of specification to be balanced properly.
In selected automatic transmissions the 4th and 5th gears run at lower speeds during highway driving. This saves fuel and engine wear as the engine runs slower and noise is reduced.
Occurs when the rear tyres lose adhesion under cornering and can cause a spin if the driver doesn’t reduce acceleration. In motorsports, this is also called loose.