Used Vehicles

Vehicle Specials

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1. Only on the 5.3L EcoTec3 V8 Engine. For trade assistance, you must show proof of ownership and trade in a 2009 model year or newer vehicle. Not available with lease and some other offers. Take new retail delivery by 12/4/23. Available accessories shown.

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1. Length of contract limited. Some customers may not qualify. Not available with lease and some other offers. Take new retail delivery by 12/4/23. 2. Not available with lease and some other offers. Take new retail delivery by 12/4/23. 3. Deferred monthly payments for 90 days. Excludes residents of PA. Must finance with GM Financial. Some customers may not qualify. Down payment required at signing, if applicable. Finance charges accrue from date of financing. Not available with lease and some other offers. Take new retail delivery by 12/4/23.

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1. To qualify for the General Motors Limited-Time Special, you must: (1) be a current Costco member by October 31, 2023; (2) register with Costco Auto Program online or through its call center by January 2, 2024 to receive a certificate with your unique promotion code; (3) present your certificate and unique promotion code to any Chevrolet, Buick, GMC dealer at time of visit; (4) take in stock delivery between November 1, 2023, and January 2, 2024 of a new 2022, 2023, or 2024 Chevrolet: Silverado 1500, Equinox; GMC: Sierra 1500, Terrain; Buick: Enclave to receive a $1,000 Costco member-only incentive or place a factory order between November 1, 2023, and January 2, 2024 on a new 2024 Chevrolet: Silverado 1500, Equinox; GMC: Sierra 1500, Terrain; Buick: Enclave to receive a $1,000 Costco member-only incentive; (5) take in stock delivery between November 22, 2023, and January 2, 2024 of a new 2022, 2023, or 2024 Chevrolet: Silverado 2500, Silverado 3500; GMC: Sierra 2500, Sierra 3500 to receive a $1,000 Costco member-only incentive or place a factory order between November 22, 2023, and January 2, 2024 on a new 2024 Chevrolet: Silverado 2500, Silverado 3500; GMC: Sierra 2500, Sierra 3500 to receive a $1,000 Costco member-only incentive. Incentive will be applied at time of eligible purchase or lease and is compatible with current eligible manufacturer incentives for which you qualify.  Incentive is subject to change due to vehicle inventory availability.  Visit CostcoAuto.com/Save for full details.

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*Ad, written estimate, or internet quote for identical tire(s) from a competing tire retailer/installer located within 100 miles of the dealer required during guarantee period for price match. Tire match price must be determined prior to applying a tire manufacturer rebate, if any. At participating dealers only. Offer ends 12/31/2023.

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1. To qualify for the General Motors Limited-Time Special, you must: (1) be a current Costco member by 10/31/23; (2) register with Costco Auto Program online or through its call center by 1/2/24 to receive a certificate with your unique promotion code; (3) present your certificate and unique promotion code to any GMC dealer at time of visit; (4) take in-stock delivery or place a factory order between 11/1/23, and 1/2/24 of a new 2022, 2023, or 2024 GMC: Sierra 1500 or Terrain to receive a $1,000 Costco member-only incentive. Incentive will be applied at time of eligible purchase or lease and is compatible with current eligible manufacturer incentives for which you qualify. Incentive is subject to change without notice. Visit CostcoAuto.com/Save for full details.

Important Information Hide Information

1. Length of contract limited. Some customers may not qualify. Not available with lease and some other offers. Take new retail delivery by 12/4/23. 2. Only on the 5.3L EcoTec3 V8 Engine. For trade assistance, you must show proof of ownership and trade in a 2009 model year or newer vehicle. Not available with lease and some other offers. Take new retail delivery by 12/4/23. 3. Deferred monthly payments for 120 days. Excludes residents of PA. Must finance with GM Financial. Some customers may not qualify. Down payment required at signing, if applicable. Finance charges accrue from date of financing. Not available with lease and some other offers. Take new retail delivery by 12/4/23. Available accessories shown.

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1. Length of contract limited. Some customers may not qualify. Not available with lease and some other offers. Take new retail delivery by 12/4/23. 2. MUST BE A CURRENT OWNER OF A 2009 MODEL YEAR OR NEWER BUICK OR GMC VEHICLE OR A CURRENT LESSEE OF A 2018 MODEL YEAR OR NEWER BUICK OR GMC VEHICLE THROUGH GM FINANCIAL FOR AT LEAST 30 DAYS PRIOR TO NEW VEHICLE SALE. Not available with lease and some other offers. Take new retail delivery by 12/4/23. 3. Deferred monthly payments for 120 days. Excludes residents of PA. Must finance with GM Financial. Some customers may not qualify. Down payment required at signing, if applicable. Finance charges accrue from date of financing. Not available with lease and some other offers. Take new retail delivery by 12/4/23.

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The History of O'Meara

O'Meara has been serving Thornton, Northglenn and the rest of Colorado since 1913.

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Welcome to O'meara GMC - Denver's Best

Our dealership is a great solution for any auto buyer, looking for a New GMC or Used Vehicles, Cars, Trucks, and SUVs. All you have to do is drop by our Thornton GMC showroom and pick what suits your needs the best, and our qualified and friendly staff will take care of the rest. We look after all your automotive needs, right from New and Used Vehicle Sales, Auto Service and Repair, GM Auto Parts, accessories, tires, as well as Automotive Financing options. Our GMC dealership is very conveniently located in Thornton near Westminster, CO. So, what are you waiting for? All Denver area GMC drivers can make the short drive to our dealership today in Thornton CO!

GMC AUTO SERVICE AND PARTS CENTER IN THORNTON

We offer parts, service, and auto body shop at O'meara GMC for your convenience. Our GM-certified technicians provide superior maintenance for your GM vehicles and all other makes and models and stand by their work. Thornton drivers will be glad to learn that keeping their automobile running well shouldn't be complicated or difficult. This is why our Certified GM service and auto parts center is a perfect option for Denver GMC drivers looking for the best in vehicle maintenance and repairs.

We look forward to meeting you and serving you in person at O’Meara GMC , the employees at look forward to your visit at our dealership. Give us a call or use our step by step Driving Directions for driving instructions from Denver, Thornton, Aurora, Golden, Littleton, Longmont, Henderson, Lone Tree, Colorado Springs, Boulder, Brighton, Pueblo, Loveland, and more.

Quick Links to Our Denver New & Used Car Dealerships

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Our Reviews

Google Dec 2, 2023

Lorenzo did a fantastic job. Everyone was nice to us and they even worked a little on our monthly payment. I am very happy with my new car

Google Dec 2, 2023

I was welcomed by Ben. He was very helpful he answered all of our questions and concerns with the upmost professionalism.

Google Dec 2, 2023

Everyone is super friendly and super quick qith everything. Recommend 10/10

Google Dec 1, 2023

Ben for being up front and honest really appreciate it

Google Dec 1, 2023

Vince was great sales man. Highly recommend

Google Nov 30, 2023

It was good, no issues.

Google Nov 30, 2023

After going to 5 dealerships, O'Meara GMC was able to fix my cruise control and transmission issues. Jeff, Annissa and Chris worked with me to get me triluck fixed in reasonable time and kept me informed of the status.

Google Nov 26, 2023

All of the people at O’Meara were extremely helpful and understanding towards what we were looking for! David, specially, was extremely kind and knowledgeable not only on the car we ended up with, but on his current inventory of what they had. He was extremely patient and I would recommend him to anyone. Management was also amazing, outgoing, and willing to work with us.

Google Nov 26, 2023

Great dealership

Google Nov 26, 2023

David was awesome and super friendly

Google Nov 26, 2023

Great experience with Stuart today thank you for the help

Google Nov 26, 2023

OMG have you guys ever needed a car/truck go here they super nice

Google Nov 25, 2023

Very good service best dealership I’ve been too!

Google Nov 25, 2023

(Translated by Google) Excellent service (Original) Excelente servicio

Google Nov 22, 2023

I liked how chloe treated and took good care of us, like how she’s easy going .

Google Nov 21, 2023

David was very helpful, recommended my sister a good truck and I wasn’t even present till the end of it so that’s a first! 💪

Google Nov 19, 2023

Both Lorenzo and Ben dis a great job! Jeremy also was very professional and patient.

Google Nov 19, 2023

Ben and Lorenzo were fantastic team and appreciate their candor and professionalism.

Google Nov 19, 2023

Took in all my concerns and options to get things done

Google Nov 18, 2023

Jose and Vince were incredible! They did everything they could to get me into my Chevy Trailblazer! I highly recommend going to O’Meara and asking for them!!! AMAZING!!!

Google Nov 18, 2023

Jose and Vince were the two sales men that worked with us I would recommend them to anyone

Google Nov 18, 2023

Manny helped us get the exact truck we were looking for. Very helpful and professional.

Google Nov 17, 2023

Nice and respectful

Google Nov 17, 2023

Logan was great, was very helpful and caring, he gave me a lot of guidance through making a purchase. He is an outstanding employee.

Google Nov 17, 2023

Although it was a while to get all of my parts Anessa did such a great job she kept in touvh woth me and got everything covered ill be bringing my car back for sure