I cant see putting a quart in and just driving it, will hurt. Sludge needs to be dissolved gradually, just like it formed. I would use MMO and drive it 1K and do a oil change, then do it again. Cut the oil filter open and see what's going on. Not sure what to look at to measure progress. Peek at the oil filler hole in the valve cover?
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize.
1977 Trans Am W72 400, TH350, 3.23 T Top
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