Diesel Southwest Service
Complete Mechanical Repair,
Expert Experienced Mechanics
24 Hour Road Service & Towing

Diesel Truck Repairs and Maintenance in St George, UT


At Southwest Diesel Service Inc., we have been providing timely, professional and honest truck repair and services to our valued clients in Saint George, UT and the surrounding areas for over 30 years.  Southwest Diesel Service offers 24/7 Mobile Roadside Truck Repair for Heavy Duty Trucks, Trailers and RV’s as well as Medium Duty Trucks.  We use the latest technology in the industry to provide our customers with a more thorough and professional truck repair, which will have them back up and running. We repair anything from all diesel engines to transmissions, we offer Fleet Maintenance Services and can do your DOT Inspections.

Southwest Diesel offers a variety of services for all makes, models and sizes of vehicles, which include Heavy Duty Tractors, Trailers, RV’s and Medium Duty pickups.  Our technicians have over 60 years combined experience for Engine Repair, Replacement, and Installation.   Ask about our Fleet Maintenance Programs in keeping your trucks and trailers in-service at all times.  Our mechanics perform all types of repairs from PM services to more extensive repairs.

Some of the services we offer include:

  • Air-conditioning Service or Repair
  • Alternators
  • Batteries
  • Brake Repair or Replacement
  • Clutches
  • Computer Diagnostics
  • DOT Inspections
  • Engines 
  • Jump Start
  • Oil Change & Lube
  • Rear Ends
  • Starters
  • Transmissions
  • Trailer Repair
    and Maintenance
  • Welding
  • Winterize RV

Authorized Dealers





We Specialize in Repairs of:

  • Freightliner LLC
  • Detroit Diesel Engines

Testimonial:

“I wanted to call and tell Doug that my truck is working great after he worked on the computer, I went to Freightliner and they told me that was the best they could do so I came to Southwest Diesel and now I am so happy my truck runs great.  I use to be a mechanic and I like to make sure I call and let people know when they do a good job.”  

                                                                                           Lighthouse- Heavy Duty Truck 07-20-15.





















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435-414-6618