Lucas Engine Oil Stop Leak (32 oz.)

When an older engine starts leaving spots on the driveway, the usual culprit is seals that have hardened and shrunk over years of heat cycling. Lucas Engine Oil Stop Leak is formulated to renew those worn seals without the risk of damage that solvent-based products can cause. It contains no harmful solvents, relying instead on a blend of Lucas additives and specific base stocks that condition seals back toward their original flexibility.

Beyond stopping leaks, this 32-ounce additive also works to reduce oil consumption and quiet engine noise. It can raise oil pressure in engines where wear has opened up clearances, which is a practical benefit for high-mileage vehicles that are starting to show their age. The formula is compatible with petroleum, semi-synthetic, and full synthetic motor oils, so it works regardless of what you are currently running.

Lucas also notes that this product can be used in manual transmissions, gearboxes, and to help with valve stem seal leaks. That versatility makes it a useful bottle to keep on the shelf if you are maintaining multiple vehicles or dealing with an older fleet.