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So, if you can say with absolute certainty that oil is not leaking above the pan, and that the only possible source of the leak is the seal between the block and the oil pan, and if the pan has been replaced, then drop the pan again and with a straight edge and a feeler gauge, check the flatness of both mating surfaces of the pan and the bottom of the block. A few thousands out of flat should not be critical because the sealant should take care of that, but certainly something is not flat there, or the threaded holes in the block are stripped out. Finally, evaluate the type of sealant being used here. Perhaps they are using a sealant that wasn't designed for the oil pan. Hard to imagine, but hen this is an odd problem.
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2007 V6 Camry LE, Built TMMK 27 September 06
"People who think they know it all are particularly irritating to those of us who do."
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