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gmc684x4 · 07-25-2020, 01:29 PM

Why such a thick oil ?
Most guys i know run 10/40 or even 5/30

20/50 is a diesel truck oil

Do you have headers?
Are they loose

Have you used comp cam lifters i have heard there fairly noisy

07-25-2020, 01:29 PM	#2
gmc684x4 Registered User Join Date: Jul 2012 Location: Whitehorse yukon Posts: 1,218	Re: 396 experts need help Why such a thick oil ? Most guys i know run 10/40 or even 5/30 20/50 is a diesel truck oil Do you have headers? Are they loose Have you used comp cam lifters i have heard there fairly noisy