Originally Posted by black_sedan

Until the motor is torn down, its hard to say its the tuner's fault. If the motor was starved for oil due to a bad oil pump you cant blame it on the tuner. Again, not taking sides... But there are so many factors outside of the control of the tuner.

Joepro's suggestion would probably be best. Put the motor back to stock and have the dealer look it over. Keep in mind, if the dealer does figure out the car was modded you can be on the hook the diagnostics labor.