i found a really good deal on a 1997 m3 it is in really good condition but has a salvage title because the interior and stuff was stolen out of it and it was later fixed, but when it was auctioned off it had no battery in it so they did not report any mileage........so it has a mileage rollback title thingy........but........someone told me that i could go to a bmw dealership and get them to plug up directly to the engine and tell me the exact mileage? is that possible?