Onyx Black 2024 GMC Sierra 2500HD Denali 4WD 10-Speed Automatic Duramax 6.6L V8 Turbodiesel.At Gjovik Chevrolet Buick GMC, We don't sell you a car, we help you buy a car! For over 56 years, proudly serving the towns of Sandwich, Yorkville, Plano, Somonauk, Oswego, Montgomery, Sugar Grove, Aurora, Sheridan, Ottawa, Dekalb, Naperville, and the surrounding Chicagoland and Midwest Illinois area. ... see more