STA-BIL 22402-4PK 360 Oil Stabilizer, Oil Additive,  Oil Treatment - 32 fl. oz., (Pack of 4) Coats oil system and improves lubrication. Prevents rust and corrosion throughout the engine. Reduces friction, heat and wear. Lowers operating temperatures extending oil and engine life. STA-BIL 360 Degree Oil Stabilizer helps prevent water from contaminating your oil. It keeps water well mixed in the oil helping prevent bearing damage and sludge buildup. For use in old and new cars, light trucks, SUVs and Diesel. Safe for all blends of motor oil, including synthetics, mineral and racing oils. Use at every oil change.