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January 2024 by Abel Rojas
Zero communication took my truck in for a repair came back the same way 3 different times and was told to run it spent 2000$ now the owner won’t answer calls or text
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August 2023 by Jorge Ortiz
Had an issue that the dealer couldn't fix... Came here and couple hours later problem solved
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July 2023 by kike Rubi
Best Diesel repair shop
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June 2023 by Raymond Armenta
my go too spot for my dura Max's
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December 2022 by Tom Barilla
They do impressive work. Tough to get in to get work done, but that's because they are amazimg at what they do. I am very particular about who works on my truck. Eli and the crew impressed me with the results. I've had my truck back almost a year now after having it broke for 19 months. Once they got it in the shop it was less than 2 weeks to do a full motor swap. When you open the hood it looks like a factory install. Egr was the 3rd shop I sent my truck to figure out what was wrong, this included simpson Gmc that diagnosed it wrong. They told me I had back injectors that were replaced only 35k before that. After spending 6k on injectors and taking it to a second shop for 6 weeks, they still told me it was bad injectors. Eli in less than 24hrs figured it out. Unfortunately it was the worst possible case. I broke the crank in the motor with only 142k. Eli guided me in with great information on my rebuild and the truck it a beast. Tows my trailer better than ever.
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December 2021 by Juan Serrano
This place is a one stop shop for all your diesle needs great staff, very helpful with all your diesle needs, this is a duramaz shop, I am a cummings guy, these guys are amazing, and knowledgeable
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September 2021 by Gilbert Montoya
I will only trust them with my truck. Very knowledgeable strait forward. Genuine great guys
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June 2021 by Osvaldo Villa
Great honest and knowledgeable staff
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January 2021 by Daryl
Great friendly owner and service. Took the time to tell me things I needed to replace and explained the causes. If you own a diesel truck, this is your best bet for knowledgeable, friendly service at a great price.
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December 2020 by Peter Costruba II
Eli and his crew are very knowledgeable and great to work with
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November 2020 by Cassie M.
My truck threw a "Check Cages" light and I watched the battery/alternator needle fall. I was traveling through so called my husband and he hopped on the web to find me a place to limp the dying truck to. He found Mad Tech Diesel Workz. They were ready for me as soon as I pulled in. The problem was diagnosed within minutes and parts were on the way. I think I only spent a few hours there and it was done. When I came in I was making arrangements to stay the night and let my friends know I wasn't going to be making it. With the help from Trenton and the team, I was able to see my friends after all and stay on time for my trip. I'm beyond thrilled with the service. If only I lived in the area, this would be the only place I'd bring my diesel for service.
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September 2020 by StrykR Redcoat
Great friendly owner and service. Took the time to tell me things I needed to replace and explained the causes. If you own a diesel truck, this is your best bet for knowledgeable, friendly service at a great price.
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August 2020 by David A.
OK just moved to Montclair and needed a Diesel Mechanic to insect a possible truck I was going to buy. Above and beyond help full and informative on every inch of the drive drain for both trucks I took to them. After the purchase they hit me with a bill I wasn't ready for but BUT I must explain I drove out of there with a truck response I wasn't ready for either! ! ! There amazing and worth every penny. They actually turned me down twice on me asking for upgrades and said I didn't need to spend the money.....Who does that now a days. So my take away is Mad Tech is - Extremely Knowledgeable and Honest - Honesty when its hard to find now a days. When I said sorry for all the questions there answer was " That's what I'm here for, come back and ask more questions latter" Wont let anyone else touch this truck.
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July 2020 by Jose Cortez
Best shop in town, and also you wont find any more honest person to tell you what is actually wrong with your vehicle.
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March 2020 by Szilvia M.
Dr of diesel . Love this place great service all around . Try them out you won't be disappointed!!