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Old January 26th, 2022, 04:43 PM
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jmfurgason jmfurgason is offline
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Join Date: Dec 2019
Location: Las Cruces NM
Truck: 1963 GMC 1000 sm420 305E lwb wideside
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Default Re: 305 V-6 engine oil

I have used Valvoline VR1 high Zinc 30W and 20W50 conventional and 80W90 in transmission and rear end Louie Louie has 305E, 420SM ,307 diff. OE cannister oil filter part # CH106PL all from AutoZone. Good days with your GMC. JF
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