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I have a 2008 GMC 2500hd with the duramax Allison combo. This was the last year they went without the exhaust fliud. "DEF" It is black crew cab short bed every option available inc navigation radio, heated seats, full power. Running boards, 4x4, TV's in the front headrests for the kiddy's. Front hitch with a T/bar to insert into front hitch and roof rack for kayaks or canoe. 50gal reserve tank with on demand transfer. A auto slider 5th wheel hitch tonneau cover 75k miles probably about 5k actually pulling. Garage kept not driven in the winter. No engine mods no programmers ever used sun