RedSrt007
Active Member
Prof said:Stan, I defer to fstjack on this one...a lot depends on where you drive...AZ or Maine...but he recommends Mobile 1 Syn 15w50 for our engines...he thinks it costs a few horses, but is way better in protecting this hot bitch of an engine we love....
There are several here that use RP maybe they will chime in...
I agree..depends on the weather condidions. I use 15w-50 in summer / dyno tuning and track, and 5w-30w in winter; 10w-40 in average temps
-Red