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My dad bought a new '56 Ford station wagon with a 292 V8 and overdrive. Being a mechanic he installed a Marvel Mystery Oil system and kept the jar full. At about a 112,000 miles he thought he heard a noise so he tore it down. The cylinders were tapered .003 to .009 and the crank just needed polishing. He was using Shell X-100 oil. MMO is the best.