Lucas Synthetic Heavy Duty Oil Stabilizer (1 Qt.)

When engine noise at startup has you concerned, or you want to get more life out of your oil changes, Lucas Pure Synthetic Heavy Duty Oil Stabilizer is a solid additive to keep on hand. This 1-quart bottle blends into petroleum, semi-synthetic, and full synthetic motor oils without voiding warranties, and it works in everything from small imports to heavy-duty diesel trucks.

Lucas recommends adding 10 to 20 percent per gallon of engine oil, which means this quart treats roughly one oil change on most passenger vehicles. In manual transmissions and transfer cases, you can bump that ratio up to 20 to 30 percent. The synthetic base stock handles high temperatures and pressures well, which is where conventional stabilizers tend to break down. Owners of high-mileage vehicles often notice reduced oil consumption and quieter valve train operation within the first few hundred miles.

Beyond engines, this stabilizer also works in gear boxes and other drive train components. If you run air-cooled engines or motorcycles that tend to run hot, the extra film strength helps protect against thermal breakdown during sustained high-temperature operation.