[78w72]

Originally Posted by AG

There is no reason to run that heavy weight oil. Oil flow is more important than the higher oil pressure you get from heavier weights of oil and as long as you are getting 15-20 psi at idle with 10W-30, then you are fine. I run 10W-30 in my race car without issue.

x100... no reason at all to use 20/50 in any street engine. people still believe the myth that it "cushions" better or some other reason that thicker is better. these aren't top fuel dragster engines & nobody in the street section needs to run that thick of oil.

its not "wrong" to use 20/50 but the benefits of a thinner oil, especially in a street or street/strip engine, far outweight a thicker oil. try a 10/30 or maybe 10/40 if you think thicker is better & you will see your engine runs perfectly fine & no damage will be caused... the bearings & oil pump rod will be much happier too & you might even gain a few HP & MPG!