I'm about to pull the trigger on a 2015 with 159K miles. I had it checked out by a local shop. Shop said it was a solid truck. The delete and tune was good. Suggested all fluids changed and a FASS System. The shop I took it to leans more towards another brand though. I'm new to the forum and don't know all the rules yet. I'm looking for a shop that works on Durmax's. Does this forum allow discussions about shops?