Cleans and protects the crankcase and engine oil system of all gas-powered vehicles, including those exceeding 60,000 miles. Conditions and revitalizes seals and gaskets to help stop engine oil leaks. Contains zinc-based ZDDP and molybdenum (“moly”) to fight friction, heat, and wear. Helps prevent sludge formation to maximize engine performance and life. Safe on catalytic converters and oxygen sensors.