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What Does Low Ash Mean in Motor Oils?
What is low ash?
-- Aundra Hood, Morgantown, WV
There are certain additives used in engine oils that, when they leak past the piston rings and get into the combustion side of the engine, can produce ash when burned. This ash can cause filter plugging in certain types of engines that contain particulate filters. This is not an issue for most engines unless you have a diesel particulate filter.