2025 Gmc Denali Ultimate Duramax. 2025 gmc sierra 2500hd and 3500hd pickup trucks equipped with the denali ultimate trim are the only truck in gmc’s lineup that come standard with the 6.6l l5p. After 3 weeks oil leak from filter area.

The luxury pickup you won’t want to get dirty. Think of the denali ultimate as checking all of.