I usually throw in a bottle of octane booster but I don't think that makes much of a difference. I've been using the highest zinc content oil that I can find.
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69 Grand Prix Model J, Cameo White/Black top, 400-350HP, automatic, unrestored 53K-mile original paint
69 GTO HT, Matador Red/Red interior, 400-350HP, automatic, Hideaways, AC, PS, PDB, original numbers matching work in progress
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