Duramax Diesel with Allison Transmission. Last model year before DEF was required. This truck has been well kept and is mechanically perfect! Plus it was just serviced. It’s a 2008 so it has a few chips in the paint and 1 small hole in the driver seat leather on the left lower back area. It is the SLT package so it is fully loaded. Additionally it has the front cattle guard bumper, remote start on key fob, the bed has spray in bed liner and has the rolling bed cover. This truck has been well loved and will drive cross country without question. No service lights are on but occasionally the “service trailer brakes” note will come on. I have more pictures available at your request.