Our unmatched service and diverse Buick, GMC inventory have set us apart as the preferred dealer in Thornton. Visit us today to discover why we have the best reputation in the Thornton area. Our trained sales staff will help you every step of the way during your shopping experience at OMeara Buick GMC. Our sales team is ready to answer any questions you have as you shop for a new vehicle in Thornton.Our GM Certified Service department has the expertise to perform a wide range of GM services. From routine maintenance to critical repairs, we take the stress out of servicing your vehicle.