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When school lets out, families across Oklahoma start thinking about where to go on vacation. 

At Mark Allen Buick GMC in Collinsville, OK, we're excited to showcase the impressive 2025 GMC Sierra 3500 HD. 

Deciding whether to buy a new or used vehicle is a common dilemma for Collinsville car shoppers. Both options have their merits. New cars offer the latest features, better fuel efficiency, and bumper-to-bumper warranties. However, they also come with a higher price tag. At Mark Allen Buick GMC in Collinsville, you can browse our extensive new inventory to see the latest models we have in stock.

The 2025 GMC HUMMER EV SUV boasts an impressive array of utility features that make it incredibly capable both on and off the road. 

When it comes time to get a new vehicle in the Collinsville, OK area, one of the biggest decisions is whether to finance or lease. 

Looking for a powerful, capable work truck in the Tulsa area? The 2025 GMC Sierra 3500 HD Chassis Cab is ready to take on your toughest jobs. 

The 2024 GMC Sierra 3500 Denali HD comes standard with advanced driver assist features like HD Surround Vision to give you a clear overhead view around the truck. 

The 2024 Buick Encore GX is a subcompact SUV with impressive utility and capability. 

The 2024 GMC HUMMER electric vehicle (EV) Pickup comes standard with the Infinity Roof featuring removable transparent Sky Panels, allowing you to enjoy open-air driving. 

The 2024 Buick Envista compact SUV offers a refined and well-equipped interior across its three available trims.