Derek Gruendemann
Derek Gruendemann at Napleton Buick GMC

Derek Gruendemann

Sales Manager

Napleton Buick GMC

6305 Northwest Hwy
Crystal Lake, IL 60014

5.0
9 Reviews
5.0

9 Reviews

Write a Review

Dealership Experience

7 mos

Industry Experience

30 yrs, 11 mos

Languages Spoken

English English

9 Reviews of Derek Gruendemann

July 27, 2026

Dealership Rating
Employee Rating

This was probably the best car buying experiences I have had, and I have been through significantly more than the average person. I found them through GM’s website. The car was as advertised and the prici More

by Mark W
Sales Price Transparency
Trade-in Experience
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Recommend Dealer
Yes

Other Employees Tagged: Freddi Alvarado, Daniel Gulo , Amber Spitzley - 5 stars

Jul 27, 2026

Napleton Buick GMC responded

We’re delighted you enjoyed such a smooth purchase of your new GMC 1500 and that our online listing and pricing met your expectations. It’s great to hear Freddi and Derek provided efficient, professional, and transparent service throughout. Thank you for sharing your experience and for the five-star rating.

July 14, 2026

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Everyone was super to deal with. I would highly recommend them to anyone . And would deal with them again More

by jfscma
Sales Price Transparency
Trade-in Experience
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Recommend Dealer
Yes

Other Employees Tagged: Erwin

Jul 14, 2026

Napleton Buick GMC responded

Thank you very much for your kind words! We pride ourselves on a hassle free, no games, car buying experience. We appreciate you trusting us here at Napleton Buick GMC in Crystal Lake!

July 14, 2026

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Freddie made it as smooth as possible purchasing a car here. We will be back for sure. More

by sarahstar414
Sales Price Transparency
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Recommend Dealer
Yes

Other Employees Tagged: Freddi Alvarado

Jul 14, 2026

Napleton Buick GMC responded

It’s wonderful that Freddi made purchasing your used Buick Verano so smooth. We look forward to helping you again soon.

July 04, 2026

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Christian and Dan were amazing and Derrik too! I appreciated their Communication, patience and availability. More

by pkoenig847
Sales Price Transparency
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Recommend Dealer
Yes

Other Employees Tagged: Santo Voiculescu, Steve Hardy, Daniel Gulo , Christian Leon

Jul 04, 2026

Napleton Buick GMC responded

We’re glad Christian, Daniel, and Derek provided clear communication and were so patient and available during your purchase. Thank you for choosing Buick for your new ride. Enjoy every moment behind the wheel.

June 24, 2026

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Fantastic people to work with in and out in a couple hours. I would recommend to everyone I know. More

by xtrigger87
Sales Price Transparency
Trade-in Experience
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Recommend Dealer
Yes

Other Employees Tagged: Eric Pedersen

Jun 25, 2026

Napleton Buick GMC responded

We’re thrilled to hear the purchase of your Chevrolet Silverado 1500 was completed so efficiently. Your recommendation to friends means a lot, and we hope you enjoy every mile in your Silverado. Let us know if there’s anything else we can do for you.

June 05, 2026

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Erin and Derrick were wonderful to work with. Great experience overall buying a used car. There was no pressure, no gimmicks or unexpected "add ons". Finalizing the purchase was easy. More

by TGMG4
Sales Price Transparency
Purchase Time
Finance Experience
Recommend Dealer
Yes

Other Employees Tagged: Erin

Jun 05, 2026

Napleton Buick GMC responded

Delighted Derek made your purchase of a used Nissan straightforward and without any surprises. We’re pleased the final steps were simple and stress-free. Thank you for choosing our dealership.

May 09, 2026

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Eric went above and beyond to get me what I was looking for. I would totally recommend this dealership to anyone due to the customer service.Everyone else was professional and pleasant to interact with as More

by Ed A.
Sales Price Transparency
Trade-in Experience
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Recommend Dealer
Yes

Other Employees Tagged: Christian Leon, Eric Pedersen

April 18, 2026

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Employee Rating

Wonderful experience. Met Eric when I walked in and the entire process was smooth and convenient. Eric and the team were extremely professional. More

by mh
Sales Price Transparency
Trade-in Experience
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Recommend Dealer
Yes

Other Employees Tagged: Christian Leon, Eric Pedersen

March 19, 2026

Dealership Rating
Employee Rating

Working with Eric and the team was seamless. A very respectful, courteous group! We are very happy with our new car!!! Thank you Eric! More

by Mckbello20
Sales Price Transparency
Trade-in Experience
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Recommend Dealer
Yes

Other Employees Tagged: Eric Pedersen

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