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Oil sludge - From Wikipedia, the free encyclopedia. Oil sludge or black sludge is a solid or gel in motor oil caused by the oil gelling or solidifying, usually at temperatures lower than 100 degrees Celsius. Sludge can be a major contributor to engine problems, and can require the engine to be replaced if the damage is severe. Sludge is usually caused by the presence of water in the oil, and can accumulate with use. Ways to minimize sludge production and accumulation include performing frequent oil changes, using synthetic oil, and following the manufacturer's engine maintenance routine.
Engine Sludge: When Good Oil Goes Bad - The threat is the buildup of sludge — gooey tarlike deposits — that reduces or shuts off oil circulation and can mean thousands of dollars to repair or replace an engine that has seized.
Oil Sludge Could Ruin Car's Engine - Thousands of car owners in recent months have been hit with an expensive engine repair, one that can cost $5,000 or more.
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