I only use Valvoline 20w-50 with a can of Restore additive in my GTO. And only Valvoline in any of the other engines I have. At least I know there's no sludge in any of them.
I'll add a 5 gallon can of 93 oct VR1 to pump gas in the GTO. Tho not for every tank of pump gas. Or 100LL if available.
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Gary
Get in, Shu T Up, Hang On !
Member of the Baltimore Built Brotherhood
MY GTO built 4th Week of March 1966
"Crusin' Is Not A Crime"
Keep yer stick on the ice.
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