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Seals timing cover, cam seal, rear main and other hard to stop oil leaksAdd to engine oilSpecifically designed to seal rear main leaks, but also works better than a conventional stop leak on all other leaksAdd entire bottle of Rear Main Seal Repair to engine crankcase (where you add oil) at or between oil changes. Do not overfill. Most leaks will stop within 100 miles or 2 days of driving
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