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Engine oil sludge

Updated: 10/23/2022
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13y ago

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Oil sludge or black sludge is a solid or gel in motor oil caused by the oil gelling or solidifying, usually at temperatures higher than 100 degrees Celsius/212 degrees Fahrenheit.

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13y ago

Usually caused by lack of oil changes or operation of the engine with under less than ideal conditions like:

  • Short runs that do not warm engine completely
  • Poor quality engine oil
  • Engine has something wrong with it so it does not run correctly

This will cause excessive wear and engine failure.

To prevent damage
  • You need to do more oil changes and repair the engine so it runs correctly
  • A badly sludged engine that has not yet been damaged will need the oil pan and rocker cover(s) removed and the sludge and the crud cleaned out correctly.
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