Mobil1
If you use a full synthetic like Mobil1, then 5W30 will work for almost any reasonable clearances and at almost any climate.
At the north pole you might need 0W30 or an engine warm up banket, LOL.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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