Family-Owned and Operated in Ontario, CA for Over 50 Years

Mark Christopher Buick GMC is a family-owned Buick and GMC dealership at 2131 Convention Center Way in Ontario, CA, serving drivers from Chino to Corona and Rancho Cucamonga to Pomona. We carries new Buick and GMC inventory, a multi-make pre-owned lot, an online finance department, and a factory-trained service center. Now in its sixth decade, the store has been recognized as California’s #1 Volume GM Dealer across multiple years and operates alongside a sister Chevrolet and Cadillac store as part of the broader Mark Christopher Auto Center.

Open Today! Sales: 9am-8pm

Who We Are

Mark Christopher Buick GMC has stayed family-owned and operated for more than 50 years, a tenure that shows up in repeat customers across San Bernardino, Riverside, Orange, and Los Angeles counties. That history includes more than $11 million raised for local charities, nonprofits, and community organizations, a giving record the dealership treats as central to its identity rather than a side note. In 2026, the store received the Ambassador of Golf Award, recognizing its ongoing ties to the local golf and business community. The sales team, certified GM technicians, and finance staff work out of one Ontario location, and the site itself runs bilingual in English and Spanish for shoppers across the Inland Empire.

News paper article about Mark Christopher Auto Center

Old ariel view of Mark Christopher Auto Center

Old photo of Mark Christopher Oldsmobile

Dealership Info

Mon - Sat9:00 AM - 8:00 PM
Sun9:00 AM - 7:00 PM

Mon - Fri7:00 AM - 5:00 PM
Sat8:00 AM - 12:00 PM
SunClosed

Mon - Fri7:00 AM - 5:00 PM
Sat - SunClosed

Inventory

Financing

When you’re ready to buy a new car or trade in your old one, don’t hesitate to drop by our car dealership

We Offer New GMC and Buick Vehicles Near Fontana, CA

Shoppers near Fontana can choose from hundreds of new GMC vehicles in stock at any given time, including the Sierra 1500 for towing and jobsite work and the Terrain for daily commuting. The 2026 Acadia adds a three-row option for larger families. On the Buick side, the lineup runs from the compact Encore GX to the three-row Enclave, with the Envision covering mid-size SUV buyers. Business owners financing a GMC work truck or van through the dealership can also look into the Section 179 tax deduction, a detail the finance team walks through as part of commercial purchases.

Reliable Pre-Owned Vehicles for Riverside and San Bernardino Drivers

The pre-owned lot at Mark Christopher Buick GMC covers Buick, GMC, and other makes, giving Riverside and San Bernardino shoppers more than one brand to compare in a single visit. Vehicles coming off the CarBravo certified marketplace carry added inspection and history reporting as a separate tier from standard pre-owned stock. The dealership also lists Retired Service Loaners, lightly used vehicles taken out of active loaner duty with documented service records, as a distinct inventory category below standard used pricing. Trade-in value through the KBB Instant Cash Offer gives shoppers a starting figure before they set foot on the lot.

GM Financing and Service for Chino Hills and Pomona

Drivers near Chino Hills and Pomona can start the finance process online through the dealership’s finance application, or use Capital One’s pre-qualification tool for a soft credit pull that carries no impact to a score at the initial inquiry step. Once a vehicle is purchased, GM Rewards tracks points toward future service and purchases. The service center runs Monday through Friday from 7AM to 5PM and Saturday from 8AM to noon, staffed by factory-trained technicians handling oil changes, brake service, and tire rotations on Buick and GMC models. For qualifying maintenance, Mobile Service+ sends a technician to a customer’s home or workplace instead of requiring a trip into Ontario, and scheduling can be done entirely online.

Serving Eastvale, Corona, and the Greater Los Angeles Area

Mark Christopher Buick GMC’s customer base runs from Eastvale and Corona through greater Los Angeles, with sales hours open seven days a week: 9AM to 8PM Monday through Saturday and 9AM to 7PM Sunday. The dealership’s charitable record and 2026 Ambassador of Golf Award reflect a presence built over decades rather than a single campaign. Drivers who want to see the current Buick and GMC lineup, review a trade-in figure, or ask about financing a commercial GMC vehicle can reach the team through the contact page or by visiting the Ontario location directly.