Oil for '98 Chevrolet K1500 - 350 Vortec

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Originally Posted By: JR
398K on the gmc z71 . It has bulk oil change in it now.. the oil was changed like under a thousand miles before i bought it. i plan to change it before winter.
i am not sure what to run yet. no leaks smoke or usage. holds 40+psi hot idle . 70-80psi cruising . 60+psi cold idle.
I have napa syn. 2cases of 0w20. 1Case 15w50. Shell dino 5w20. Nextgen maxfile 5w20. Syntec titanium. dexos approved 5w20(30quarts.

ken


40psi when hot at idle. Does it have a high volume oil pump or something. It seems really high to me.
 
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