what is the price on replace rear main seal
try BLUE DEVIL REAR MAIN SEALER FIRST, that repair is well over a thousand dollars...
Engine size? Automatic/manual? Depends if you can find a mechanic who will do the job without pulling motor. The transmission at least will have to be removed. If the leak isn't major, you can try some of the stop-leak products.
You have to pull the engine or trans to replace the rear main lip seal. You could try Liqui-Moly Motor Oil Saver.
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