As your GMC dealership, we have the trained technicians and technology to provide the level of care and maintenance you and your GMC deserve right here at our GMC Service Department. We want to tell you more about a few signs you need to visit us for GMC maintenance.

GMC in Stillwater, OK

Worn Alternator

The alternator helps produce electricity for vehicle systems. The alternator is very robust, only usually requiring replacement after around seven or eight years (however this varies depending on mileage and driving habits). When an alternator starts to wear out, its electricity production drops and will continue to fall until the alternator fails.

A drop in electricity supply might not be immediately noticeable. Once the alternator can’t supply power for all your vehicle’s systems, you’ll experience issues like dim lights, slow accessories, and seemingly random electrical glitches. We’ll test your alternator and replace it if it’s failing.

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A good work truck needs to be strong, reliable, and durable. For those jobs where you need to be pulling heavy loads or moving over uneven surfaces, a heavy-duty truck is essential. That’s where the 2025 GMC Sierra Heavy Duty trucks come in.

2025 GMC Sierra 2500HD Stillwater, OK

Power and Capability

If you want a heavy-duty truck with ample power, the available Duramax® 6.6L Turbo-Diesel V8 engine is for you! This engine gets paired with the Allison® 10-speed automatic transmission. This engine provides a whopping 470 horsepower and 975 ft-lb of torque. Its power comes from the strong turbo vane actuator and the robust valve springs.

For the jobs that require extremely heavy loads, a Sierra Heavy Duty truck is your reliable pickup. The 2500 Crew Cab models offer a maximum towing capacity of 21,870 pounds when properly equipped, while the 3500 Regular Cab offers a maximum hauling capacity of 36,000 pounds when properly equipped. Towing those heavy loads is made much easier with advanced trailering technologies and up to 14 camera views available.

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Reliable and immensely capable, the 2025 GMC Sierra 1500 is an excellent pickup truck for handling all your day-to-day tasks. It can be equipped with one of many gas or diesel engine options, depending on whether your work requires more towing or hauling prowess.

2025 Sierra 1500 in Stillwater, OK

Robust Engine Options

The Sierra 1500 offers a TurboMax™ engine that can produce an impressive 310 horsepower and 430 lb-ft of torque. A large-charge air cooler ensures that only cool air reaches the engine, enabling it to perform exceptionally well in hot weather. When properly equipped, the pickup truck tows up to 9,500 pounds with this engine. If you need more muscle, GMC offers two additional gasoline and one diesel engine options.

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