2150 Technology Drive
O Fallon, MO 63368

Get Directions

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

1614 total reviews

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

5.0 (out of 5)

This was our 2nd purchase from Paul in less than a year.

Reviewed by jimrothweilDecember 01, 2025

This was our 2nd purchase from Paul in less than a year. He very easy and down to earth to work with. So if you’re in the market for a car are trucks go see Paul at O’Fallon GMC you’ll be happy you did.

  • 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)

I had a great experience there they will definitely help

Reviewed by CharistyheardNovember 30, 2025

I had a great experience there they will definitely help you find what your looking for and you will leave satisfied

  • 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)

I could not be happier with this dealership!

Reviewed by NAHALASKANovember 30, 2025

I could not be happier with this dealership! The guys in the service department are super helpful!

  • 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.

Ready to buy? Get a price quote before visiting the dealership.

  • Get multiple quotes
  • No cost, no-hassle negotiation
Back to Top