Lucas Heavy Duty Oil Stabilizer is the number one heavy duty and high performance oil supplement. It eliminates dry starts and resists thermal breakdown for total protection in new engines. It stops smoking, knocking, and oil consumption in worn engines and adds lubricity for more MPG. It lowers oil temperatures and stops leaks. Use it in any manual transmission or differential to stop wear, leaks, heat, noise and hard shifting. Will not void new car warranties. Since it is pure petroleum, it safely blends with all petroleum products, including synthetics. US gallon bottle.