Lucas Heavy Duty Oil Stabilizer is the number one heavy duty and high performance oil supplement in the US. It eliminates dry starts and resists thermal breakdown for total protection in new engines. It stops smoking, knocking, and oil consumption in worn engines. It raises oil pressure and adds lubricity for more miles per gallon (M.P.G.). In addition, it lowers oil temperatures and stops leaks. It also extends oil life by at least 50%. Use it in any manual transmission or differential to stop wear, leaks, heat, noise & hard shifting. Using Lucas Heavy Duty Oil Stabilizer will not void new car warranties. Since it is pure petroleum, it safely blends with all petroleum products, even synthetics.