Responsive Menu

Reliable Mobile Diesel Repair – We Come to You

Keeping your trucks and equipment running with fast, on-site diesel repairs—anytime, anywhere.

CALL NOW! Contact Us

Truck Repair

Fast, reliable truck repairs to keep your rig running strong—wherever the job takes you. See More

Trailer Repair

On-site trailer repairs to keep your load secure and your haul on schedule. See More

Roadside Assistance

Expert maintenance and repairs to keep your vehicle safe, reliable, and road-ready—right at your location. See More

Fleet Maintenance

We provide preventative maintenance designed to minimize downtime, extend the life of your equipment, and keep your trucks and trailers running reliably on the road. See More

Trusted Diesel Repair in the St. Louis Metro – McCallon’s Diesel Services

At McCallon’s Diesel Services, we take pride in keeping your trucks, trailers, and heavy equipment running at their best. With years of hands-on experience and a commitment to quality workmanship, we specialize in reliable diesel repair, preventative maintenance, and roadside service that keeps you moving. Our team understands the demands of the road and works hard to deliver fast, honest, and affordable service—whether you’re a local business, an owner-operator, or managing a fleet. At McCallon’s Diesel Services, we don’t just fix engines—we build lasting relationships based on trust, integrity, and performance.

Our Diesel Repair & Maintenance Services

Engine Diagnostics & Repair

Transmission & Drivetrain

Electrical & Lighting

Brakes & Suspension

Heating & AC

DOT Inspections

Trailer Repair

Fleet Services

Emergency Roadside Assistance

Proudly Serving the St. Louis Metro Area

We provide reliable diesel repair across St. Louis and the surrounding metro communities. Whether you’re in St. Charles, St. Louis City, Foristell, or nearby, we’ve got you covered.

 AND OTHER SURROUNDING AREAS
Need Diesel Repair Fast? Call McCallon’s Diesel Services 24/7
Call Now (314) 400-1142

What Drivers & Fleet Owners Say About Us

  • First off, Rich is very kind, cares about his customers!!!, and gives plenty of information so you know the what and why. Also, the quote response was very fast, with excellent follow up communication.

    Seth - Wentzville, MO

  • McCallon's helped me out. I needed my radiator replaced and my front brakes replaced on my 2019 Dodge Charger. A great and fair price did not break the bank.

    John B. - Weldon Spring, MO

  • Rich went above and beyond to ensure the servicing was complete and the starting issue we were having was resolved with a battery and terminal end.

    Scott D. - Colorado Springs, CO

  • Great service and fair pricing. Also extremely responsive and friendly. Highly recommended.

    Christen D. - Mount Pleasant, SC

  • Would highly recommend to anyone looking for any mechanical services. Will definitely be calling for any future instances. Fair pricing as well!

    Brad S. - CA

  • They had it fixed the next day for a very fair price. I describe Maccallons as honest, dependable and affordable. Never going anywhere else.

    Shawn S. - Gulf Shores, AL

  • Great fair price. Easy to work with and very knowledgeable. I think I found my new mechanic

    Brandon T. - San Francisco, CA