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10w-30 all year round. On a race motor I'd use 5w-30 or straight weight depending on the temperature. On a brand new rebuild or newer style motor with tighter tolerances I'd use a nothing but Amsoil 5w-30.
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, Jon
Owner of a Red Sled.
If it\'s EFI I can tune it. Specialize in 82-95 GM (yes Lt1\'s)
\"If you can leave black marks on a straight from the time you exit a corner till the time you brake for the next turn.......Then, you have enough horsepower\" - Mark Donohue 
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