Check the listing for details. HAPCO - Main Sta - STOPS OIL LEAKS IN ANY ENGINE. WORKS AS YOU DRIVE!. Condition: New. Listed at 39.99 USD. Main StaEffectively stops oil leaks in any engine – GuaranteedCompatible with all conventional and synthetic oilsRepairs and reconditions rubber seals to help prevent future leaksHelps make new or rebuilt engines LEAKPROOFSafe for use in all gasoline, diesel and marine enginesHapco Main Sta sealer is a unique, 100% pure blend of natural and synthetic lubricants. Effectively stops and prevents engine oil leaks by revitalizing all rubber seals and gaskets. Compatible with all conventional and synthetic oils. Main Sta is also recommended as a superior break-in additive for new or rebuilt motors. Makes new engines LEAKPROOF by lubricating vital areas to help prevent wear and shrinkage. Does not contain petroleum distillates, which can harm or destroy seals. For Best Results: Add one 16 oz. bottle of Main Sta directly to engine oil. Drive vehicle as normal to allow circulation of fluids. No need to change oil immediately after leak is repaired, Main Sta will dissipate on its own. Safe for all gasoline, diesel and marine engines. Size - 16 oz. Part No. - 400 Made In USA - Money Back Guarantee - Proven Results Since 1960 Visit HapcoProducts.com to learn more!