O'Neil GMC

O'Neil GMC O’Neil GMC is a premier provider of GMC and GM Certified Pre-owned automobiles. CUSTOMER SERVICE- Our customers are the reason we exist.

Through a partnership with quality conscious clients, we guarantee complete satisfaction with our products and services. Our commitment to quality is reflected in our concern and response to customer needs. EMPLOYEES- O’Neil’s employees are the backbone of the company and the foundation upon which our success is built. O’Neil’s growth is a direct result of the performance and professionalism of ev

ery individual. We are committed to employee development well being and growth. Employees are our most valued assets!

The best in safety, control and entertainment - OnStar One gives you the features to take your drive to the next level.G...
06/02/2026

The best in safety, control and entertainment - OnStar One gives you the features to take your drive to the next level.

Get the OnStar One Plan: https://shop.onstar.com/

A master of maneuverability, the GMC HUMMER EV makes high precision the standard.
05/29/2026

A master of maneuverability, the GMC HUMMER EV makes high precision the standard.

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Command power, capability, and comfort with the GMC Sierra Denali Ultimate.
05/27/2026

Command power, capability, and comfort with the GMC Sierra Denali Ultimate.

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Today we were honored to be part of the Memorial Day Parade in Warminster, PAOur O’Neil GMC Sierra had the privilege of ...
05/25/2026

Today we were honored to be part of the Memorial Day Parade in Warminster, PA

Our O’Neil GMC Sierra had the privilege of pulling the band through the parade as the community came together to remember and honor the brave men and women who made the ultimate sacrifice for our country.

Thank you to everyone who came out today!❤️🤍💙

Reach the peak of professional grade with the GMC Sierra 1500 Denali Ultimate.
05/25/2026

Reach the peak of professional grade with the GMC Sierra 1500 Denali Ultimate.

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Our sales department is open until 2:00 today 5/25, parts and service is closed. We will resume normal business hours 5/...
05/25/2026

Our sales department is open until 2:00 today 5/25, parts and service is closed. We will resume normal business hours 5/26.

https://www.oneilgmc.com/

Memorial Day Hours at O'Neil GMC Please note our holiday hours for Monday 5/25/26:🔧 Service Department: CLOSED🚗 Sales De...
05/22/2026

Memorial Day Hours at O'Neil GMC

Please note our holiday hours for Monday 5/25/26:

🔧 Service Department: CLOSED
🚗 Sales Department: OPEN from 9AM – 2PM

📞 Questions? Give our team a call at 215-672-0900.

We hope everyone has a safe and enjoyable Memorial Day weekend! ❤️💙

Congratulations to Evanna & Yan on this beautiful 2022 GMC Terrain! Thank you for trusting us to help you find the perfe...
05/22/2026

Congratulations to Evanna & Yan on this beautiful 2022 GMC Terrain! Thank you for trusting us to help you find the perfect ride!

Check out our pre-owned selection, here 👇
https://www.oneilgmc.com/searchused.aspx

Address

869 W Street Road
Warminster, PA
18974

Opening Hours

Monday 9am - 8pm
Tuesday 9am - 8pm
Wednesday 9am - 8pm
Thursday 9am - 8pm
Friday 9am - 8pm
Saturday 9am - 5pm

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