2024 Denali Duramax Leveled Specs. Sierra hd denali’s standard 6.6l. 2024 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.
2 of mine run delo 5w40 year round and the newest one i’m trying the ultra low ash delo 600 adf 15w40. Leveling a 2024 denali 1500 3.0l.