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The GMC Sierra 1500 is back for 2026 with an impressive array of utility features to make your driving experience more convenient and capable than ever.
Safety comes standard with the 2025 GMC Sierra EV. This groundbreaking electric truck showcases the latest advances in driver assistance and collision avoidance technology to provide unprecedented protection and security. From automatic emergency braking to lane keep assist, the new Sierra EV has your back in O'Fallon and across Missouri.
The 2025 GMC HUMMER EV SUV delivers unrivaled utility for your O'Fallon adventures. With an advanced Ultium Drive System featuring three electric motors producing an estimated 1000 horsepower and 11,500 pound-feet of torque, this electric SUV conquers any terrain. The Continuous Damping Adaptive Ride Control and electronic 4-wheel steering with CrabWalk functionality provide impressive handling both on and off the road around Overland.
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.