Lucas Heavy-Duty Oil Stabilizer is a pure petroleum multi-use oil supplement. Use it to control noise, heat, and wear in manual transmissions and differentials. This is a 100 percent petroleum product formulated to eliminate dry starts and reduce friction, heat, and wear in any type of engine. It allows motor oils a higher degree of lubricity, which reduces oil consumption and operating temperatures. Use Lucas Oil Stabilizer in gear oil to stop leaks, reduce operating temperatures, and increase the life of the gear oil. Since it is pure petroleum, it can safely blend with all other automotive lubricants, even synthetics, ATF, and mineral oil. It keeps old engines alive and new engines new.