One bottle of Rislone Ring Seal increases viscosity and cleans rings to prevent oil from leaking past the rings into the combustion chamber.FUNCTION - Stops Exhaust Smoke & Seals, Worn Pistons, and Rings DOSAGE - One Bottle Treats 4 to 6 Quarts of Oil Stops Exhaust SmokeQuiets Engine NoiseReduces Blow-By Coats Pistons, Rings & Bearings