Maintenance and Repair Services for Medium and Heavy-Duty Trucks

At OKC Fleet Services we specialize in comprehensive maintenance and repair services for medium and heavy-duty diesel trucks. Our team of experienced mechanics is equipped to handle a wide range of issues, ensuring your fleet stays on the road and operates at peak efficiency.

Common Issues with Diesel Trucks

Diesel trucks, particularly medium and heavy-duty models, often encounter a variety of issues that require expert attention. Some of the most common problems include:

  • Engine Overheating: Caused by issues such as coolant leaks, malfunctioning water pumps, or clogged radiators.
  • Fuel System Failures: Problems with fuel injectors, fuel pumps, or fuel lines can lead to poor performance and reduced fuel efficiency.
  • Electrical Issues: Faulty wiring, alternator problems, or battery failures can cause significant downtime.
  • Transmission and Clutch Systems Troubles: Wear and tear on transmission and clutch components can lead to shifting problems and gear slippage.
  • Brake Wear: Heavy-duty trucks require robust braking systems, which can wear out quickly under constant use.
  • Exhaust System Problems: Issues with the exhaust system, including the diesel particulate filter (DPF) and exhaust gas recirculation (EGR) system, can affect performance and emissions.

Our Expertise in Diesel Truck Repair

At OKC Fleet Services we have the expertise and equipment to address these common issues and more. Our services include:

Engine Diagnostics and Repair

Utilizing advanced diagnostic tools, we accurately identify and repair engine problems, ensuring optimal performance and longevity.

Fuel System Maintenance

From fuel injector cleaning to complete fuel system overhauls, we keep your trucks running efficiently.

Electrical System Repairs

Our mechanics are skilled in troubleshooting and repairing all types of electrical issues, ensuring reliable operation.

Transmission and Clutch System Services

We provide comprehensive maintenance and repairs for both transmission and clutch systems, from fluid changes to complete rebuilds.

Brake Services

Our brake services include inspections, repairs, and replacements to ensure your trucks can stop safely and reliably.

Exhaust System Repairs

We handle everything from minor repairs to complete exhaust system replacements, ensuring compliance with emissions regulations. This includes work on diesel particulate filters (DPF) and turbocharger maintenance.


Our team of trained & certified heavy & medium duty truck repair technicians are standing by ready to serve you! At OKC Fleet Services we offer multiple heavy & medium-duty fleet repair options from engines and transmissions to suspensions and driveline repairs. Can’t make it to us? That’s ok, we offer 24×7 emergency roadside services to get you back on the road! 

OKC Fleet Services is proud to serve Oklahoma City, Edmond, Norman, Moore, Midwest City, Yukon, and surrounding metros with exceptional fleet management services and repair services.

Frequently Asked Questions

Our specialty is working on diesel engines. These are found in light, medium and heavy duty trucks. They are found in heavy equipment, RVs, buses, generators, and more. So that is our bread and butter so to speak. We also work on gas vehicles and trailers. And we work on all aspects of the chassis- engine, transmission, radiator, air conditioning, brakes, suspension, tires, and more.

I have a fleet and I have my own mechanics, how can you help me?
Most businesses with large enough fleets have their own mechanics in house. The way we are working with these types of customers is helping them out when they get busy or helping them with things they don’t have the expertise to do. For example, we have a customer that uses us whenever they have an issue that needs diagnostics. We also have a customer that only uses us during their busy time of year.

Yes, we have mobile trucks that enable us to do maintenance and most repair work at our customer’s site. We can do all preventive maintenance services on site such as oil changes. Schedule your Fleet Repair Service in OKC 

Yes, our normal business hours are 7:30AM-5:00PM. We are available by appointment only for service outside those hours. This means we can schedule a preventive maintenance service early in the morning, later in the evening, or on the weekend. We are also available 24/7 for roadside emergencies.

We have robust diagnostics capabilities that enable us to work on all major brands and engines. From vehicle manufacturers like International, Peterbilt, Kenworth, Mack, Isuzu, Hino, Ford, Ram, Chevrolet to engines such as Caterpillar, Detroit, Cummins.

Yes, at OKC Fleet Services we have the capability and knowledge to work on reefer units.

Our goal with our pricing is to be middle of the road. We are typically priced lower than the dealerships and leasing companies, and higher than a lone mechanic or a quick lube. Please reach out to us for more details. (405) 876-7003

Yes, we take calls 24/7. Call us now for roadside assistance! 

We thought there was an opportunity to do some fundamental things well, and thereby provide great value to our customers. Fundamental things like: quality work, responsive customer service, and quick turnaround time. To do these things with integrity and at a fair price. We thought this would deliver value to our customers and create a thriving business.