Light & Medium Duty
Diesel Repair Shop
in Houston, Texas

At Longhorn Diesel we specialize in light and medium duty diesel repair. Our service representatives are highly qualified and ready to assist with all of your needs. We serve the Houston area and beyond.

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Products

At Longhorn Diesel we work with the best manufacturers and distributors in the industry. We can customize any vehicle. Bring in your Chevrolet, Ford, Dodge, or GMC for a custom consultation.

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AirDog / Diesel Rx

Airdog Fuel Preporator

Pacbrake

Auxiliary Braking Solutions

South Bend Clutch

Clutches

Gorilla Performance

Custom Tuning

Diesel Truck Makes & Models

We're proud to service the following diesel vehicle makes:

Lifted F350 Superduty with blue under lighting
Ford and GMC getting oil changes in the shop
Front view of Longhorn Diesel in Texas with 2 lifted diesel trucks out front
Ford and Chevy diesel pickups getting serviced in the shop

Services

Diesel trucks take a lot of work to ensure they're runing to their full potential. It's important to ensure basic services like brakes and tires are checked often, but there are more technical aspects like glow plugs and fuel filters that need care too. Longhorn Diesel works hard to make sure you get the right service for your vehicle.

Air Conditioning

Recharge, repair, and get your A/C pumping back at full capacity.

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Badass Builds

We'll work with you to build the beast of your dreams. Check out our work.

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Brakes

Not as sexy as a turbo but just as important. Callipers, pads, full service.

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Coolant Systems

Proper maintenance saves money. Ensure your coolant is running right.

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Diesel Diagnostics

Our mechanics use the best tools on the market to ensure accurate readings.

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Electrical

Ground wires, batteries, ECMs: well figure out your electrical issues.

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Fuel Systems

A properly maintained fuel system is essential to top performance.

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General Maintenance

Pay small bills now and save on the big bills later. Full inspection service available.

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Oil & Fluid

Keeping your fluids maintained is essential to the proper function and longevity of your vehicle.

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Performance Tuning

We are paired with the leading tuning companies in the industry.

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Repair & Rebuild

Rebuild, repair, or replace? We'll help you find the right answer for your truck.

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Suspension

Custom suspension installs and suspension repair is one of our specialties.

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Tires & Wheels

We supply a large selection of tires and rims of including balancing and installations.

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Transmission

A small amount of maintenance work now can pay off huge in the future.

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Call The Shop

Have a pressing issue and need to talk to someone right away? Give us a call and we'll help you walk through your problem and find the right solution.

+1 832-707-8577
2019 F350 getting ECM tuning serviceFord and GMC getting oil changes in the shopFlatbed Ram 3500 HD getting suspension serviceFront view of Longhorn Diesel in Texas with 2 lifted diesel trucks out front

Customer Reviews

"Longhorn Diesel was suggested to me by another service provider that didn’t have the equipment needed to perform the repairs my 3500 Dodge needed. First let me say they kept me informed, were fair on price and got my vehicle back to me in a timely manner. They were professional and had my truck back to me in pristine condition while finding other issues that were not identified. They also sent me video of the issue showing me the required work done and new issue identified."
William Rogers
Dodge Ram 3500
Easily the top diesel mechanic in Houston.  Denmar and Longhorn Diesel have serviced my truck (2015 Duramax) for 2+ years, and the work, service, communication and pricing are excellent.  This is the only place I trust with my truck.  I highly recommend Longhorn Diesel!  Many thanks to you and your team, Denmar!
J. Wayne Ballew
Dodge Ram 3500
These guys do awesome work, Denmar is a honest gentleman & takes time out with each & every one of his customers. They went above & beyond of what I paid for, to make sure my truck was in safe & good operating condition at no additional charge! As I'm not looking forward to any more repairs, when that time does come again I will definitely be right back at Longhorn Diesel👍🏼!
Jay Lampkins
GMC Sierra
After about 10 shops telling me no or giving me an unrealistic price. I came across Longhorn Diesel. I called Denmar and he was very down to earth and you can tell by how he talks that he isn’t your typical diesel mechanic. He genuinely took the time to get my truck right as well as him and I having a great conversation sharing what we both love to do. I would 110% recommend him to everybody I know of. Down to earth guy. Great business. Fair pricing. All around great business and I will be back.
Cole Heferle
Dodge Ram
After about 10 shops telling me no or giving me an unrealistic price. I came across Longhorn Diesel. I called Denmar and he was very down to earth and you can tell by how he talks that he isn’t your typical diesel mechanic. He genuinely took the time to get my truck right as well as him and I having a great conversation sharing what we both love to do. I would 110% recommend him to everybody I know of. Down to earth guy. Great business. Fair pricing. All around great business and I will be back.
Cole Heferle
Dodge Ram

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