About Us

Founded in 1958, Diesel Specialists of Green Bay Inc. has been locally owned and managed for over 60 years. The current owners, Brian and Wendi Tomcheck, bought the business in 2001 and are both actively engaged in daily operations.

Brian can repair anything diesel, but his area of expertise was rebuilding diesel engines and transmissions. After earning a degree in automotive repair from Northeast Wisconsin Technical College, Brian worked as a diesel technician in central Wisconsin for 24 years before he and Wendi purchased Diesel Specialists. Wendi contributes her expertise in bookkeeping and office management. With the help of their dedicated employees, they have built a reputation as one of the premier diesel repair centers in Wisconsin.

Recognized by all major fuel injection OEM suppliers, Diesel Specialists of Green Bay uses OEM parts in rebuilds and repairs and carries a full range of OEM products.

In 2006, Diesel Specialists moved into its state-of-the art facility at 2264 Mid Valley Drive in De Pere, Wisconsin. With an eye on the future, the Tomchecks designed the service bay to accommodate all sizes and types of heavy equipment and vehicles.
Since 2001, Diesel Specialists has been authorized by 10 engine manufacturers to provide support for their engines, which includes warranty repairs, parts and service. We can rebuild your engine or supply you with a factory reman engine. Diesel Specialists is a proud member of the Association of Diesel Specialists.

Brian, Wendi and the rest of the staff at Diesel Specialists of Green Bay Inc. look forward to hearing from you, whether you are a first-time or a long-time customer. If you need a question answered or diesel vehicle repaired, Diesel Specialists has the expertise you’re seeking and takes pride in meeting customers’ high expectations.

Give Diesel Specialists of Green Bay a call today at 920-347-0880 or 1-800-242-8060 or visit our facility at 2264 Mid Valley Drive in De Pere, WI 54115 during our business hours of 7:30 a.m. to 5 p.m. Monday-Friday.


Was having some trouble w/ my 2500 diesel, these guys were able to diagnose it quickly and were straight up about the repairs required. They didn’t try to sell me on anything special, they took care of the repairs that were needed in a most cost effective manner and offered suggestions on repairs for the future.


Their mechanics are diligent and professional and imo some of the best in the industry, best of all they’ll explain things the way they are. If you can handle the most technical of answers they have it, if you need a more distilled version of that answer they can do that too. The service managers are a pleasure to talk with, very professional, patient, and have a genuine understanding of how to communicate between customer and mechanic.


Diesel Specialists are exactly that and are an outstanding shop. They made my truck work, so i could work.

Scott Ryan

I would recommend them. I have an old idi non turbo and all I did was call and describe the issues I was having with my truck and the guy was very knowledgeable and told me the likely issue with the details and descriptions I gave him and he was spot on!

Kevin Tucker

I dropped off four tractor injectors to be evaluated at 07:30 AM. The manager, Elliott Piton, tested the injectors while I was standing there and showed me all the issues with the injectors. He researched my tractor data and picked out the best parts for my engine. He rebuilt all four injectors in under three hours and my tractor down-time was under five hours. Excellent service. I am now a life time customer. Thanks to Elliott’s customer service.

Michael Garvey