ENGINE OIL TREATMENT is a fast-action, multi-power oil additive engineered for high performance engines. Compatible with all petroleum and diesel engines. TOP 1 Engine Oil Treatment increases the viscosity index, making the engine oil more viscous (thicker) at higher temperatures to ensure higher oil film thickness. By coating the engine with a film of oil, ENGINE OIL TREATMENT prevents premature wear, improving engine performance and prolongs engine life. This product also helps stop oil burning, reduces hydraulic valve lifter noise and improves compression. In addition, ENGINE OIL TREATMENT is recommended for use in both gasoline and diesel engines.