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Missoula Diesel Truck Repair & Maintenance

Regular maintenance is the key to getting the most out of your vehicle. You shouldn’t have to sacrifice trust and peace of mind when finding a repair center for your diesel. We are a certified NAPA Truck Center. NAPA Truck Centers are built around a quality standard

where independent business like Rocky Mountain Diesel are invited based on integrity, qualifications, and expertise. That’s how NAPA ensures you get the best in class service that you deserve. From routine maintenance to major repairs, we’ve got you covered.

Did Montana’s winter take a toll on your truck?

Montana winters are incredibly hard on vehicles. Could your truck use some special attention after a long winter?

Missoula Diesel Maintenance & Repair

If there’s one thing that gets us through long Montana winters, it’s gorgeous Montana summers. Get your diesel truck tuned up — it’s time to hit the open road with friends and family.
T TiT Ti
21:47 04 Jan 22
Mando was very professional. Took their time to figure out the problem with my truck when I was at ends to finding the problem. His staff took their time and located the issue when other shops had no idea. I was patient and the results were good. I would highly recommend them to anyone, as they have been very helping with myself and my families diesels.
Tim GarciaTim Garcia
13:46 28 Dec 21
I had vehicle inspection done before buying my truck to make sure I wasn't going to have any problems. They found several leaks and other issues that needed to be addressed. They got me in fast and saved me thousands of dollars. Thanks for the help.
Aundrea PenaAundrea Pena
01:16 05 Dec 21
Had electrical gremlin and while it took some time to figure out, they were persistent at helping me solve my problem. Thanks to Mando, Tyson, & Spencer for being diligent and patient.Services provided were; Oil change, replaced def pump & heater, cleaned out def tank, replaced faulty cam shaft position sensor, & solved intermittent electrical issue.
Jeremiah HilgenbergJeremiah Hilgenberg
17:14 25 Oct 21
Great company always willing to help and not just make money off of you. Knows lots about what they do 10/10 recommend
Jerry AllenJerry Allen
21:51 26 Jul 21
Best run garage I’ve been to. Was stuck with low fuel pressure light and had to leave the pickup for repair. Left package in back seat but they delivered them to my door. Great customer service and caring for their client. Everyone is knowledgeable and quick to get me back on the road. Wish there was a shop like them in every city along my travels.Happy Trails everyone !!!!Jerry

We Build a Better Diesel.

Everything You Need For Your Diesel Truck

Diesel Repair and Maintenance

We use high-quality NAPA parts and provide exceptional work; work that you can feel confident about, knowing it’s backed by our 12 month, 12,000 mile Nationwide Peace of Mind Warranty. With the largest network of independent mechanics in the U.S.

Rebuilt Diesel Engines

RMD remanufactures a complete line of domestic and import diesel engines including Caterpillar, Cummins, Detroit, Ford, GM, International, Isuzu, and Perkins. We offer both immediate exchange and custom manufacturing programs designed to minimize your downtime.

Fleet and DOT Compliance

At Rocky Mountain Diesel, we know how important it is to keep your fleet on the road and running efficiently. We can work with you and your fleet to design a preventive maintenance program that meets your needs and help prevent costly breakdowns.

Our Services

      • Diesel Truck Repair
      • Rebuild Diesel Engines
      • Diesel Maintenance
      • Fleet & DOT Inspections
      • Performance & Accessories
      • Full Replacement Parts

Some Happy Customers

“This is simply the best place in town to take your rig. They were not only open and honest with me, they took care of me with absolute grace in a stressful situation. If I can recommend any shop to anybody in town it’s here. They are the best, hands down. Thank you guys for all the work, patience and kindness you showed me! I will be in again soon for my maintenance!”
Tia Stagg

Missoula, MT

“We had an overheating issue in our diesel pusher motorhome, and when I called RMD I was told to bring it right in. They analyzed the issue quickly. Kerry & team started the repair and got us back to our travels asap. We aren’t locals – we are from out of state. Made no difference to this team, they got us rolling again at a very fair price. I wish I could find others like this as we travel!”
Eric Kaiser

San Antonio, TX

“Awesome people, worked us in, did extra things that did need to be done. Got us back on the road faster than I anticipated!!
Hasan Milon

Managing Director, Cora Ltd

Rocky Mountain Diesel


4755 Grant Creek Rd
Missoula, MT 59808

Phone: 406.721.0091

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