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I once had a noise that i thought for "SURE" it was a lifter...turned out i was 2 quarts low of oil....ouch...not a good time to forget to check your oil level.
I once thought sea foam was awesome till i heard it through the grape vine that its not that good for your system. Sea foam is a fuel injector cleaner/oil sludge cleaner additive/ whatever you want it to be.