What is oil?

oil filter

Glossary “oil filter” Definition:
Component located near the oil pump that removes abrasive particles from the engine oil by a straining process as the oil circulates through the lubrication system.

oil gallery

Glossary “oil gallery” Definition:
Passages drilled or cast into the cylinder heads, engine block, and crankshaft to receive pressurized oil from the oil pump for distribution throughout the engine.

oil cooler

Glossary “oil cooler” Definition:
1. A device used to cool oil or automatic transmission fluid. 2. A device used to cool race-car manual transmission and final-drive lubricants.

oil dilution

Glossary “oil dilution” Definition:
Thinning of oil in the crankcase, usually caused by fuel seepage past the piston rings from the combustion chamber.

oil dipper

Glossary “oil dipper” Definition:
Small scoop located at the bottom of the connecting rod in early engines to dip into the oil to lubricate the rod bearings.

oil clearance

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.