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Derek Gruendemann
Derek Gruendemann at Napleton Buick GMC

Derek Gruendemann

Sales Manager

Napleton Buick GMC

6305 Northwest Hwy
Crystal Lake, IL 60014

5.0
6 Reviews
5.0

6 Reviews

Write a Review

Dealership Experience

6 mos

Industry Experience

30 yrs, 10 mos

Languages Spoken

English English

6 Reviews of Derek Gruendemann

July 04, 2026

Dealership Rating
Employee Rating

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

by pkoenig847
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Trade-in Experience
Purchase Time
Recommend Dealer
Yes

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

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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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Employee Rating

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
Purchase Time
Finance Experience
Recommend Dealer
Yes

Other Employees Tagged: Eric Pedersen

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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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Employee Rating

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

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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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Employee Rating

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.
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Trade-in Experience
Purchase Time
Finance Experience
Recommend Dealer
Yes

Other Employees Tagged: Christian Leon, Eric Pedersen

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April 18, 2026

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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
Purchase Time
Recommend Dealer
Yes

Other Employees Tagged: Christian Leon, Eric Pedersen

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March 19, 2026

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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
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Trade-in Experience
Purchase Time
Finance Experience
Recommend Dealer
Yes

Other Employees Tagged: Eric Pedersen

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