I use 10-30 Valvoline race Oil in my 67 GTO. A friend who runs big block Chevelles told me about a product he uses in them made by Rislone, called Nano Prime so I put a bottle in my GTO. The car runs quieter and smoother than it ever has. You only add it once a year.
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Remember no one is perfect. Everyone's butt has a crack in it!
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