My truck started make a knocking noise. I took it to the dealer and am being told it needs a CP3 that's bad due to fuel contamination from the slip tank.

The truck is a 2015 3500 with a 68RFE and has 78k miles and is absolutely stock apart from a bumper and slip tank. The slip tank is plumbed through a cat fuel filter into the stock tank.

Any advise to argue my cause with the dealer or did I just lose the warranty on the motor as a whole?


Thanks.