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Synthetic is great for Rollers but it can wipe a flat tappet.

I don't think so, just saying



A true synthetic is slick enough that the lifters can quit rotating.


Lifter rotation is caused by taper in the lobes face. I doubt if less friction would cause lack of rotation. That being said. I've built 2 customer motors that were long term builds, 7 years BB Mopar, 13 years SB Chevy. Both had mild .500" lift hydraulic cams. Both used Mobil One. Both sit for long periods of time. Both had hydraulic flat tappet cam failures. My theory is possibly most of the oil drained of the cam. Neither were idled fast after long term start up. Therefore minimal oil splash to the cam. Only a theory. I do run Mobil one in my solid flat tappet motor w/o issue.
Doug



You`re kidding right?



No