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I noticed a new engine cleaner on the shelf of a local parts store.
It was in a fancy boxwith color graphs showing the affectiveness of
how this cleaning process affected different parts of the engine. I
think it was STP but sorry, I need to go back to the store to verify.
My mechanic told me to use this stuff. He called it STP Oil Treatment. He
said if this doesn't quiet it down then he recommended changing the lifters,
but only if the racjet really really bothered me.