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Message: [QUOTE="blacksmoke.r.us, post: 1494476, member: 5336"] There's plenty of powerstrokes out there that run convention 15w40 since new and they're still running decades later. Its all about regular maintenance! Switching to a synthetic may or may not help in this instance, but if it was fine before with 15w40 rotella then it should be fine with it now. Like previously stated with out ids you cant see what's going on in the hpop sytem and you need to before you change things that may not be needed to change. [/QUOTE]

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