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jgreene0717 · 02-26-2009, 09:48 AM

I would say it really depends on the mileage of your motor. I run 10w40
conventional Castrol GTX in my GM
Goodwrench crate 350. But have ran
20w50 in higher mileage engines.

02-26-2009, 09:48 AM	#2
jgreene0717 Jason Join Date: Sep 2008 Location: Wetumpka, AL Posts: 152	Re: Recommended Oil for a factory 350? I would say it really depends on the mileage of your motor. I run 10w40 conventional Castrol GTX in my GM Goodwrench crate 350. But have ran 20w50 in higher mileage engines.