Synthetic for an older motor?
07-01-2010, 03:01 PM
#12
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We recommend AMSOIL 15w-50 DOMINATOR. This oil was specifically designed for a marine application. Many other Synthetic oils are just too slippery and can/will do bad things over time. I say stick to a good straight racing oil OR you wont go wrong with the AMSOIL Dominator or the Mercury Synthetic! -Eric
07-01-2010, 06:12 PM
#13
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07-01-2010, 07:46 PM
#15
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07-02-2010, 08:21 AM
#17
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I've used Mobil 1 15W50 in marine motors with roller cams since '99. Not one issue with it being too slick and flat spotting the rollers on the lifters. Amsoil claims their product is superior to Mobil 1, yet provides more friction in the motor so the rollers on the lifters don't slide. Say again? More friction = better oil?
07-02-2010, 08:35 AM
#18
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Pretty sure that is an urban legend. No one has ever published a study or even more than anecdotes about that happening. GM has a few problems with rollers in the lifters early on and the would seize and flat spot or wear through. But if synthetic was a problem with rollers there would be a whole bunch of dead Corvettes, etc. out there.
07-02-2010, 08:46 AM
#19
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my two cents , is i have switched some newer higher horsepower vette and mustang engines to synthetic and been burned by leaks that were not there with good conventional oil . my point being that when switched back no leak . everybody has a opinon i run 15w 40 rotella t with nothing but great things to say about it plus whole lot cheaper than syn. also i change oil more often than i should cause it makes me feel better !
