Red Line 60202 Lead Substitute - 12 oz. Prevents valve seat damage in engines designed for leaded gasoline Prolongs the useful life of older engines without updated valve seats Also cleans carburetor deposits and injectors, safe for catalytic converters. For racing, marine, or off-road use only one bottle treats up to 25 gallons Prevents valve seat damage in engines designed for leaded gasoline Also cleans carburetor deposits and injectors, safe for catalytic converters. For racing, marine, or off-road use only one bottle treats up to 25 gallons For racing, marine or off-road use Prevents valve seat recession Prolongs the useful life of engines