2150 Technology Drive
O Fallon, MO 63368

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Sales: 636-630-1006

Used Cars: 636-630-1006

Hours Toggle

Sales Department

Sun Closed
Mon 9:00am – 8:00pm
Tue 9:00am – 6:00pm
Wed 9:00am – 8:00pm
Thu 9:00am – 6:00pm
Fri 9:00am – 8:00pm
Sat 9:00am – 6:00pm

Service Department

Sun Closed
Mon 7:30am – 6:00pm
Tue 7:30am – 6:00pm
Wed 7:30am – 6:00pm
Thu 7:30am – 6:00pm
Fri 7:30am – 6:00pm
Sat 7:30am – 1:00pm

Reviews of O'Fallon Buick GMC

Overall Rating:

4.9 (out of 5)

97% recommend this dealer

1619 total reviews

Showing the most recent reviews from Cars.com and DealerRater.

5.0 (out of 5)

Chris Cayce was very professional and understanding of

Reviewed by JLR9899December 07, 2025

Chris Cayce was very professional and understanding of all my questions. Would highly recommend. It took extra time to get everything done only because ended up buying two vehicles at the same time.

  • Does recommend this dealer
  • Shopped for a used car

Overall Experience 5

Customer Service N/A

Quality of Repair N/A

Friendliness N/A

Pricing N/A

Maximum rating = 5

5.0 (out of 5)

From the minute I walked in the door Christy was so

Reviewed by spedroley1116December 07, 2025

From the minute I walked in the door Christy was so comforting and made this so easy. I had been to many dealerships with them keep telling me no. I had been to one the night before leaving in tears and heart broken. They wanted $8.000.00 down. How can a single lady paying all the bills come up with that money?? Well I sat down. She smiled at me and said turn around. Is that the color of the 2026 Encore GX you picked out? She made a copy of my license and sent me on my way down the road. When I got back she sid with a smiled How do you like it?: I said I love it. Then the process went from there. Jarrod was awesome to deal with as well with signing the paperwork. It took me a little over 2 hours which it didn't seem like that long. I could of stayed 6'6. It felt like I was right at home I would totally recommend buying from Christy or any of that staff really. I am very pleased with how they do business. They showed me where the service department was, restrooms was, snacks was Showed me how to download the Buick app. As soon as I pick up my baby I will.be happy. Thank you Christy , Jarrod, and all who helped me along the way with the continuous text with questions and concerns about it all. You made me feel totally at ease as soon as I walked in the door. Each and everyone of you You all do it together to make a team. Team work makes dream work

  • Does recommend this dealer
  • Shopped for a new car

Overall Experience 5

Customer Service N/A

Quality of Repair N/A

Friendliness N/A

Pricing N/A

Maximum rating = 5

5.0 (out of 5)

Don and Chip in service are the best!

Reviewed by LEWISMARINEDecember 06, 2025

Don and Chip in service are the best!!! Excellent communication and quick turn around! Highly recommended!!

  • Does recommend this dealer
  • Came in for service or repair

Overall Experience 5

Customer Service N/A

Quality of Repair N/A

Friendliness N/A

Pricing N/A

Maximum rating = 5

About O'Fallon Buick GMC

At O'Fallon Buick GMC, we're more than just a car dealership in O'Fallon. We're also members of the greater St Peters, Chesterfield, St Louis St and St Charles MO communities, who work and live here just like you, and we want only what's best for our neighbors. We strive to support community initiatives and events, and we're committed to delivering the best customer service around, from new Buick and GMC sales, to used vehicles, to finance and service. We provide the best of the best to all our customers. Whatever you're shopping for, our sales team is here to ensure a seamless experience throughout every step of the vehicle-buying process. Know exactly what you want? Great! We'll help you secure the best financing for your budget. Not sure where to start? No problem! We can help you narrow down your options, so you can select the best Buick or GMC for your needs.

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