Onyx Black 2026 GMC Sierra 1500 Denali RWD 10-Speed Automatic EcoTec3 5.3L V8 10-Speed Automatic, Black Leather. Advertised price includes all manufacture available rebates please check with dealer for qualification details. All vehicles are subject to prior sale. Listed sales prices exclude tax and license and dealer installed options. All finance offers OAC. Residency restrictions apply. CALL 909.975.3998. Mark Christopher Auto Center is the largest Chevrolet, Buick, Cadillac and GMC dealer in California! Being centrally located in Ontario, CA. Allows us to easily serve the Los Angeles metro area. Family owned and operated since 1975, with a friendly staff who can help you find your next Brand New or Certified Pre-Owned Vehicle. Please confirm the accuracy of the included equipment by calling us prior to purchase.