Usually caused by general use and seal degradation, a leaking rear main seal is often no simple fix. Rislone Concentrated Rear Main Seal Repair is designed specifically for crankshaft rear main seals to rejuvenate seals that have shrunk, become brittle and hardened. The concentrated formula also contains polymers that seal and repair grooves or scratches in the seal mating surface caused by general wear and tear. Rislone Rear Main Seal Repair will also help to stop leaks in all engine oil seals, valve stem seals and O-rings while rejuvenating all seals to prevent any potential leaks happening in the future. Rislone Concentrated Rear Main Seal Repair is safe to use in all petrol, diesel and LPG vehicles including supercharged and turbocharged applications. It is compatible to mix with all conventional mineral, semi and full synthetic engine oils and doesnt contain friction modifiers making it suitable for use in motorcycles and ATVs fitted with wet clutches. 1 Bottle of Rislone Rear Main Seal Repair treats most vehicles up to 6L of oil capacity and for use in smaller engines such as motorcycles and ATVs, 93mL per every 1L of oil is recommended.