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Fwiw, I've used (almost exclusively) Schaeffer's 7000 and (now) Amsoil XL for 171000 miles, and my engine is just as clean as can be, top and bottom. I have seen evidence of serious slugging with RP in other engines. Not scientific, but it's out there.

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Subjective vs. objective, I suppose. I ran RP for a short while way back when the car was new, before Shell owned them. The moly content was much higher back then.

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