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You could take it to BMW first and let them look at it. Their automatic response will most likely be engine replacement. Their quote is going to be well north of $30K from what most people on the forum are saying. After that I would have a specialized performance engine shop (that has rebuilt BMW engines) diagnose it. There are a couple instances on the forum where it was just a blown head gasket and I pray for you that is all it is. Unfortunately this is the curse of the s63tu motor. But that is the risk we take with these cars. Good luck brother.
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G80 M3 - Just getting started
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