Glossary “oil drain plug” Definition:
Located in the lower portion of the oil pan. Used for draining and changing the engine oil.

Glossary “oil clearance” Definition:
Space between the main bearing and crankshaft journal, usually 0.0001 to 0.003 inch (0.025 to 0.076 mm), for lubricating oil to circulate.

Glossary “oil control ring” Definition:
Bottom piston ring that scrapes oil from the cylinder wall.

Glossary “oil cooled piston” Definition:
Piston that is cooled by a jet of oil sprayed under the dome of some diesel and endurance race engines.

Glossary “oil burner” Definition:
Car or truck that uses excessive oil, generally evident by a smoking exhaust.

Glossary “oil canning” Definition:
Sheet metal panel popping from convex to concave and/or vice versa.

Glossary “oil circuit” Definition:
Paths which a fluid takes in the operation of components.

Glossary “oil circuitry” Definition:
Visual diagram which shows the paths that oil travels to and from a component.

Glossary “oil bleed passage” Definition:
Internal orifice that bypasses a metering device to ensure a positive oil return to the compressor.

Glossary “oil bath filter” Definition:
Engine air filter that channels the air through an oil bath that traps duct and debris.

Glossary “oil bleed line” Definition:
External line that usually bypasses a metering device to ensure positive oil return to the compressor at all times.

Glossary “oil air separator” Definition:
Device used to prevent the aeration of oil.

Glossary “oil analysis” Definition:
Process for determining contaminants in engine oil.