AMSOIL 10w-40 or 30, blended with Mobil 10w-30 high mileage
1990 #1727 performance rebuild 7000 miles, exhaust valve seals installed
1 quart of blend added every 2000 miles
I agree the topped off oil consumes the quickest. I'll drain a few ounces from the catchcan every 500 miles which is more than others, but I like that the catchcan works effectively.
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1990 #1587 garage queen, doesn't get driven enough to analyze oil consumption.