New and used 2026 GMC Sierra 1500 SLT trucks for sale near Berkeley, IL

Marquartd of Barrington is an amazing dealership because of their integrity and great customer service! I bought my new car 2017 and have relied only on them to maintain it. They are trustworthy and truly care about the customer. Their work ethic and philosophy reflect heavenly standards. I will never go anywhere else!

It was such a good truck honstly the greatest thing I have ever drove in my entire life I am so happy that I have been blessed with this being my first ever car

We drove 3 and a half hours to go to this dealership. We could not have asked for anything more, these people are top-notch people. This place was clean, people were friendly and helpful. John O'Connell Was our salesman and we could not have picked a more perfect person to work with. We went in to buy a Yukon AT4, left with the Yukon, and purchased another car from them. We have found a car guy and dealership that will always have our business.

Battery wasn?t installed correctly. I had returned my car to get the battery installation corrected and had to miss work. I was disappointed with the work.

Needed key fobs replaced. They were ordered and came in within the next couple days. Scheduled the service appointment and all was completed within two days. Have received great service upon all my visits.

Always a great and personalized experience! Definitely a VIP experience with every transition and handoff throughout the entire experience. Dominic and the rest of the team personalize the experience, and go above and beyond. The follow-up is next level between the technology and personalized touch. They have a loyal customer in our family!

Shelley Barr was the very best salesperson I have ever dealt with and I have purchased lots of vehicles!!

Excellent as well as timely service. However, was not told in advance that paying with Credit Card would have a 3% fee.

Fantastic people and service, it’s what brings me back here. I could go anywhere, but because of the people, I come here.

The staff is very experience and professional. The estimate for repairs were in line with the services. I compliment the facilities with free coffee, water and soft drinks.

The entire team at this location far exceeded our expectations! Our sales consultant Sandi was extremely easy to work with, and he had our best interest in mind when working on a deal for a new truck. When it came time to financing, Alex ensured we got in and out with exactly what we needed. He provided us personal stories bridging to his recommendations that help guide my wife and I in a direction that surpassed what we originally had in mind. Finally, throughout the visit Edgar and Manny ensured we felt comfortable as we worked though a deal that would ultimately have us driving home without any doubts in a vehicle that can grow with my family. They were the cherry on top to an already excellent experience. Thank you from the bottom of our hearts for such a great team!

I really appreciate the straight-forward buying process I found at Napleton Schaumburg GMC. Thank you to Yiannis for answering all my questions! Best- Mark

Have never been disappointed in 30 plus years dealing with service department and their employees. If there turns out to be more problems than what you came in for they video the area and you can see it on your phone. Would never think of going to a different place for service.

My salesman Esad was great. He was very knowledgeable. Everyone was very friendly and helpful.

Easy to schedule service. They shuttled me to my home and back and were super fast and on time!

Excellent service Professional service Quick service Polite customer service Excellent customer communication Very detailed repairs

See the salesman, Mike super nice guy. He will take your time with you and not push you like most. Do super down to earth person. I would go back there again. actually, everybody there is super nice. They will take care of you.

Nathan and Kevin was great. They made the car buying experience very simple and made sure that all of my questions were answered. Im very happy with my new Envista.

alex gave me a great deal on our new buick..... thank you so much alex.

Second car I purchased from castle gmc our sales person was Nubia /great experience every time helpful and always greats us as family highly recommend castle gmc Nubia and Brandon will take very good care of you . 👍🏻

Great Cars and also good service. Vincent Vega was very helpful thank you Vincent for all your help. This is our third car from Castle Buick GMC. We loved thank you .!