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The 2026 Buick Enclave is a full-size SUV that offers head-turning style and modern sophistication. Its sleek exterior design is sure to make a statement as you cruise the streets of O'Fallon, Missouri.
The 2026 Buick Encore GX is a sporty sub-compact SUV built for an engaging driving experience.
At O’Fallon Buick GMC, our Vehicle Exchange Program puts the power of your current vehicle’s value to work right away. Simply bring in your car, truck, or SUV, and our Vehicle Exchange Specialist (a sales manager with the authority to act fast) will ensure you get top dollar without the back and forth negotiation. It’s a seamless transition: use your equity toward a brand new Buick or GMC right here in O’Fallon—saving time, effort, and hassle in the process.
Trading in through the…
The 2025 GMC Acadia debuts with an impressively redesigned interior that provides more room for passengers and cargo, making it an excellent choice for Missouri families in and around O'Fallon. With its spacious and versatile cabin, the GMC Acadia is now more accommodating than ever before. Get to know this redesigned SUV before shopping at O'Fallon Buick GMC.
When it's time for a new vehicle, many savvy shoppers are turning to leasing as a cost-effective alternative to traditional financing. Leasing a car, truck, or SUV can offer several compelling benefits over buying, making it an attractive option for those looking to save while still enjoying a new vehicle.
If you're planning to trade in your current vehicle, a little preparation can go a long way in helping you maximize its value. Dealerships look at a variety of factors when assessing trade-in vehicles and presenting your car in the best possible condition can make a noticeable difference in the offer you receive.
Start with a basic clean-up. Washing and vacuuming your car may seem minor, but first impressions count. A clean, well-maintained vehicle signals to appraisers at our dealership that you’ve taken good care of it.
Summer is just around the corner, and that means hot weather and road trip season will soon be here. Is your Buick ready to beat the heat? Servicing your vehicle before the scorching summer months is important to ensure it runs smoothly and reliably all season long.
For those in the market for a capable, premium SUV, the latest GMC lineup is sure to impress.
When transporting a large group in St. Louis, the 2025 GMC Savana 2500 Passenger Van delivers the space and amenities to keep everyone comfortable. The standard 12-passenger seating features a 2-3-3-4 configuration, with the rear 4-passenger seat in a convenient 50/50 split design. Front bucket seats are trimmed in durable vinyl and include inboard armrests and head restraints.
The 2025 GMC Sierra 3500 HD, available now at O'Fallon Buick GMC in O'Fallon, MO, offers a range of powerful engine options to tackle even the toughest jobs. With a 6.6-liter V8 gasoline engine producing 401 horsepower and 464 pound-feet of torque or the brawny 6.6-liter Duramax turbodiesel V8 cranking out an impressive 470 horsepower and 975 pound-feet of torque, the Sierra 3500 HD has the muscle to handle heavy payloads and trailers with ease.