Oil 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.
The following engines were reported by their manufacturers to have a problem with sludge accumulation:
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