Rislone Oil Treatment is a high-viscosity formula developed for older and higher mileage engines to increase oil film thickness, building a thicker oil cushion and increasing oil pressure in worn engines. Cushions and coats engine parts to reduce friction and wear by preventing metal-to-metal contact between moving parts giving your vehicle longer engine life. Increased oil pressure equals increased power and a quieter running engine. Improved high-performance formula performs better in both hot and cold weather. Works with all gasoline and diesel engines using conventional, high mileage and synthetic oil.