Welcome to Mark Christopher Buick GMC Ontario's #1 Volume GM Dealer

A family-owned Buick and GMC dealership at 2131 Convention Center Way in Ontario, CA, Mark Christopher Buick GMC offers new and pre-owned vehicle sales, financing, and a full service department. We've served the region for more than 50 years and hold the distinction of California's #1 Volume GM Dealer. Our sales floor stays open 9AM-8PM Monday through Saturday and 9AM-7PM Sunday, and our team works across new inventory, trade-ins, and maintenance for drivers throughout the Inland Empire, from Ontario to greater Los Angeles.

The Latest Buick and GMC Vehicles Available Near Los Angeles

Shoppers near Los Angeles can find a full 2026 lineup at Mark Christopher Buick GMC. The 2026 Buick Envision suits commuters who want a compact crossover with easy city parking, while the 2026 GMC Terrain gives growing families extra cargo room for weekend trips. Drivers who tow for work can step up to the 2026 GMC Sierra 1500, built for jobsite hauling. Hundreds of new GMC vehicles stay in stock alongside the full Buick SUV lineup, giving Los Angeles-area shoppers plenty to compare.

The Pre-Owned Inventory at Mark Christopher Buick GMC Near Riverside

Riverside drivers looking for pre-owned value can start with our Retired Service Loaners, lightly used vehicles that come off active duty with documented service history and clear ownership records. Our certified pre-owned selection also runs through CarBravo, a used-vehicle marketplace with added inspection and reporting. Every vehicle on our lot, new or pre-owned, carries the same 50-year reputation for straightforward dealings. Multi-make trade-ins beyond Buick and GMC, including several trims, also fill our pre-owned lot, giving Riverside shoppers more to compare in one stop.

Trade-Ins and Financing at Mark Christopher Buick GMC in Ontario

Ontario buyers can start the finance process with a trade-in value through our KBB Instant Cash Offer. From there, drivers can apply for financing online or work through Capital One's pre-qualification option, a soft-pull step that carries zero impact to a credit score during the initial inquiry step. Our finance team handles new Buick, new GMC, and pre-owned purchases the same way for Ontario-area customers. Commercial buyers can also review Section 179 tax deduction details before financing a GMC work truck or van.

Scheduled and Unscheduled Buick and GMC Service Near Rancho Cucamonga

Rancho Cucamonga drivers can rely on our factory-trained technicians for oil changes, brake service, and tire rotations, all handled with GM parts and procedures. Scheduling works entirely online, so appointments can go on the calendar without a phone call. For qualifying maintenance, Mobile Service+ sends a technician directly to a customer's home or office instead of requiring a trip to Ontario. Service runs Monday through Friday 7AM-5PM and Saturday 8AM-Noon, giving Rancho Cucamonga commuters flexible drop-off and pickup windows near Ontario.

Local Drivers From Ontario to Los Angeles Choose Mark Christopher Buick GMC

Mark Christopher Buick GMC serves drivers from Ontario to Los Angeles, along with Riverside and Rancho Cucamonga, across the Inland Empire market. Over 50 years in business, the dealership has raised more than $11 million for local charities and nonprofits, and its 2026 Ambassador of Golf Award reflects that same community involvement. Ontario shoppers who want to see the current Buick and GMC lineup in person are welcome to stop by the lot or reach out through our contact page to set up a visit.