Pops says Quaker State Super Blend. Lots of folks complain how dirty QS looks when you drain it, but more dirt in your oil means less in your engine. The trouble comes when you don't change it regular and that dirty oil starts to gum up. That being said, I still use Castrol in all my machines.
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'68 Custom/10 w/396/TH400 matching #'s
'00 C3500 Dually 454 Crew Cab
'99 Chevy Tracker 4x4 (1 tuff little muther!)
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