AGS Company's Stop Oil Leaks is a special blend of ingredients that helps to restore the original sealing ability of brittle engine seals. As most engine oil leaks are caused by dried out seals; adding Stop Oil Leaks can rejuvenate a leaking engine. Stop Oil Leaks only targets the seals and does not thicken or cause possible adverse affects to the actual oil. Just add Stop Oil Leaks once to oil and stop oil leakage for good.