Use every oil change. Fights friction to help protect against engine wear by providing a thicker cushion between moving engine parts. STP Oil Treatment, the racers edge. High viscosity formula specially formulated to help fight metal to metal friction by providing a thicker cushion between moving engine parts. Excellent for all cars, light trucks and SUV's. Fights friction to help: protect against engine wear, reduce oil consumption, protect engine parts. Try the complete line of STP Oil Additive products: 4-Cylinder Oil Treatment, Smoke Treatment and Engine Stop Leak.