Sludge meaning

Sludge definition

A thick, black, mushy, greasy deposit found throughout the interior of the engine. Caused from a mixture of dust, oil, gasoline , water, and blowby being whipped together by the moving parts. Some engines oils have detergent to break down sludge. A composition of oxidized petroleum products along with an emulsion of oil and water, forming a pasty substance that clogs oil lines and passages and interferes with engine lubrication. Sludge is formed in engines with neglected oil changes.

Automotive Dictionary Index

Automotive terms beginning with "S", page 23

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