Originally Posted by Gene K
Never saw any reason for anything beyond standard 5W-30 or 10W-30 M1 in a street driven Roller Cam L98. SuperTech or Amazon Synthetic has the correct approvals if you don't want to deal with the M1 Rebate.
You can make a case for 15W-50 if you are pushing 300F Oil Temps at Open Track Events.
Hmm, according to the dash the hot oil psi at idle is like 9psi, hence I was thinking a 40wt.