Cummins, Duramax & Powerstroke
Cooper Diesel Repair
Diesel & Auto Repair · Union, Missouri
Mon-Fri 8:00 AM - 5:00 PM · Closed weekends
The work
What we do, numbered like a parts list
- 01
Light duty diesel repair
Ram Cummins, Ford Powerstroke, and GM Duramax. It's on the sign because it's the specialty.
- 02
General auto repair
Not just diesels. Customers bring us their non-diesel vehicles for repair and maintenance too.
- 03
Tires
Car and truck tires, and trailer tires too, installed here at the shop.
Fixed right with genuine parts, and an itemized bill at the end of it. That's how our customers describe it, in their own words further down this page.
Heads off, cylinders open, in our own bay.
“You'll probably have at least a two week wait to get in - because they're THAT GOOD.”
Tobey Dale, in a five star Google review. We'd rather be worth the wait than quick and careless.
On the lifts
Trucks, mostly. That's the point.
A look around the shop on ordinary working days.
Out front on the gravel, off the South Service Road.
The shop
A diesel shop on the service road
We specialize in light duty diesel truck repair: Ram Cummins, Ford Powerstroke, and GM Duramax. It's the line arced around the C on our sign, and the sign itself is new: it went up on the wall in August 2026. You'll find us at 2528 S. Service Rd East in Union.
We're a NAPA AutoCare center and a member of the Union Area Chamber of Commerce. Cards and debit are accepted, and the shop is wheelchair accessible: parking, entrance, and restroom.
4.4
from 42 Google reviews
8-5
Monday to Friday
Reviews
In our customers' words
“If a full service diesel shop is something you are looking for, you found it here.”
“…walking in the door you are greeted with smiles and a handshake.”
“My husband and I have always had fantastic service to our vehicles, Brandon is very thorough and honest, always goes above and beyond to make sure everything that needs serviced is done in an efficient manner and his team does a great job.”
“Didn't have an appointment they let me just swing by and solved my problem quick and easy”
“When you want you vehicle fixed right with Genuine parts I recommend these mechanics!”
“…i’ve always got itemized bills that comes out to great honesty from cost of part to labor hours it takes to get the job done.”
“I have found them to be fair, honest and trustworthy.”
“I won't take my truck anywhere else unless I'm traveling and don't have a choice!”
Tires
Car, truck, and trailer tires
Straight from our own Facebook page: we do more than car and truck tires, we also do trailer tires.
Call about tires“(Picture is my truck, with the new tires they installed)”
Henry Meyer, from his five star Google review
Visit
On the South Service Road in Union
Truck acting up?
Call the shop, or email a photo or two of what's going on with the year, make, and model. A picture usually tells us more than a form ever could.
cooperdieselrepair@gmail.com · Mon-Fri 8:00 AM - 5:00 PM