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Douglasbeale: there is a product called “engine restore” that is about the only additive I will use in my oil. On an older motor, it does a lot of good. A gentleman named “project farm” on YouTube did a review of it, and it actually raised the compression in his tractor for well over 100 hours until the oil needed to be changed again. Right before he changed the oil, the compression was still high. Wally world usually carries it.Edit: it is also very much a liquid, unlike Lucas sludge.