My engine builder told me to use Joe Gibbs Racing oil. expensive oil change, but cheaper than broken/worn parts!:lolhit:

too slippery ? can you give a example of a negative outcome from that ?

I went with Brad Penn Semi-Syn (http://www.bradpennracing.com/)
20w-50. At half the price.

Randy

The roller lifter skids across the lobe it does not roll., A bad thing. :drink:

I like Brad Penn also.

If a roller lifter did that it was not from oil being to slippery..your junk is junk...

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?

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.

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 !

Great feedback
 

Thanks to everyone for the feedback It is all incitefull. Keep 'em coming if you got 'em!