NormWild

Nothing but old threads on the subject. RPM is saying 15W50 which seems awfully high for stock bearing clearances. A&A agrees this seems high and just runs stock oil weights. Anyone with any further input on the subject? Just for reference I've been running a 30W for 40K miles with no issues.

theandrewo

NormWild

Nothing? Damn, you can't even mention oil on any other car forum without 500 opinions. I just bumped up to Amsoil 10/40W.

ZincGT

I run Rotella 15/40, inexpensive and I have never had an issue.

harleyreb1

I run mobile 1 5w/30

jayyyw

I ran 15-50 in my LS7 and plan to continue running that in my new setup.

saplumr

If you’re saying you run sae 30 with no issues it’s evident you don’t drive in the winter.

NormWild

Not a straight 30W, 10W/30, but you are correct on winter driving, car gets stored around October.