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I use 20/50, I use it because it's thicker and therefore seals better. When I switched to it, the truck stopped using so much oil (leaking and blowby). AC filters all the time.
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1942 Master Deluxe
1969 C/10
1985 Blazer CUCV
1987 Jimmy
2004 Tahoe
2005 Silverado 1500
2005 Silverado 3500
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