Lucas Oil 10278 Petroleum Engine Oil Treatment Stop Seal Leak (1 Quart) Bottle Part # 10278 Lucas Engine Oil Stop Leak is an all new formulation of Lucas additives and very specific base stocks designed to stop seal leaks in engines! KEY BENEFITS:Compatible with petroleum, semi-synthetic and full synthetic motor oilsRenews worn seals with no risk of damage or eventual corrosionReduces engine noise and oil consumption, while raising oil pressureContains no harmful solvents