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My 84 300D had an oil leak at the rear of the motor I once thought was caused from a rear main seal leak, however it turned out to be a leak between the block and head. I ended up buying some new bolts and the 12pt tool to torque them down, afterwards the leak either stopped or slowed so much that it wasn't very noticeable. There were many puddles under the car when it was leaking.... Are you certain it is the rear main?
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