Axle grease. Believe me this ain't new. I saw it in 1962 with a '48 Ford sedan (bone stock).
Leaves heavy black marks too. When I inspected those black marks, they were very "gooey". They were pure axle grease for 20 ' or so.
All that from 100 HP in 3000 lb. car. Burn outs don't mean a thing, but if that's what you want, then go for it.
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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