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The same high zinc and phosphorus formula as our original break-in oil, now in a SAE 5W-30 viscosity for tight clearance and/or low temperature break-in. Good for restrictor plate engines, drag race engines, and OEM rebuilds. Provides excellent ring sealing. Requires no additional additives. Good for full power pulls on the dyno, one night of racing or up to 400 miles on the street.