Complete Repair Support for Trucks, Fleets & Equipment

When a vehicle or piece of equipment is down, you need more than a quick fix. You need a repair partner with the experience, diagnostic capability, and equipment to identify the problem properly and get it resolved.

At Mr. Diesel Inc., we provide repair services for heavy-duty trucks, commercial vehicles, fleet equipment, diesel engines, and specialized mechanical systems. From routine repairs to complex troubleshooting, our team is equipped to handle a wide range of mechanical issues under one roof.

More Than Engine Repair

Many companies know Mr. Diesel Inc. for engine work, but our capabilities extend far beyond engines alone.

We support commercial operators, fleet managers, contractors, owner-operators, and businesses that depend on reliable vehicles and equipment to keep operations moving. Our team handles everything from diagnostics and inspections to major repairs and ongoing mechanical support. Rather than sending vehicles to multiple providers, customers can often have repairs, diagnostics, inspections, and related mechanical services managed through a single relationship.

Our repair capabilities include:

Heavy-duty truck repair
Fleet vehicle repair
Engine diagnostics and troubleshooting
Engine repair and rebuilds
Drivetrain and axle repairs
Suspension and steering repairs
Brake system repairs

Commercial inspections
Electrical troubleshooting
Advanced diagnostics
Emission system diagnostics and repair
Transmission and clutch services
Tire sales and replacement
Specialized mechanical repairs

Tire support

We are also a tire dealer and carry most major tire brands and sizes, allowing customers to handle repairs, maintenance, and tire replacement through a single service provider.

Find the Right Repair Service

Heavy-Duty Repair

Engine & Powertrain

Inspections & Compliance

Drivetrain & Axle Repairs

Crane Repair Support

Not Sure What's Causing the Problem?

Many customers contact us before they know exactly what's wrong. A warning light appears. A vibration develops. A leak starts. Something begins making a noise it shouldn't. One of the most common things we see is customers waiting too long after the first signs of a problem appear. Check engine lights, warning indicators, unusual noises, vibrations, leaks, squeaks, and clunks rarely resolve themselves. Left unchecked, small issues can often turn into larger and more expensive repairs.

"Vehicles don't heal themselves."

If something feels off, our team can assess the issue, perform the necessary diagnostics, and help determine the most appropriate next steps. You don't need to know exactly what the problem is before contacting us.

Experience That Extends Beyond
the Repair

Choosing a repair provider isn't only about fixing today's problem. It's about finding a team you can rely on when the next issue arises.

Mr. Diesel Inc. has built long-term relationships with commercial operators, fleet owners, contractors, and businesses throughout Calgary by focusing on practical solutions, honest recommendations, and consistent service.

What sets us apart:

Decades of Mechanical Experience

Our team brings years of hands-on experience diagnosing, repairing, and maintaining commercial vehicles and equipment across a wide range of industries.

Specialized Diagnostic Capability

Complex issues often require more than basic scan tools. We invest in specialized diagnostic equipment and tooling that many shops simply don't have access to.

Full-Service Repair Support

From inspections and preventative maintenance through to major repairs and advanced diagnostics, customers can access a broad range of services through one provider.

Commercial & Fleet Focus

We understand the impact downtime has on operations, scheduling, customer commitments, and profitability.

Long-Term Relationships

We're not focused on maximizing every individual repair invoice. Our goal is to build relationships that help customers keep their vehicles operating reliably over the long term.

A Straightforward Repair Process

We believe customers should know exactly what happens after they contact us.

Initial Conversation

Contact our team and explain the issue, symptoms, or service requirements.

Assessment & Diagnostics

If additional investigation is required, we perform the appropriate inspections and diagnostics to identify the root cause.

Clear Repair Recommendations

Once we understand the issue, we provide recommendations and discuss available repair options.

Repair Completion

Approved repairs are completed by our team using the appropriate equipment, tooling, and procedures.

Ongoing Support

For many customers, the relationship doesn't end after a single repair. We continue supporting ongoing maintenance and future service needs as they arise.

Repair Solutions Across Multiple Service Areas

From routine maintenance issues to complex troubleshooting projects, our team supports a wide variety of repair requirements across commercial and heavy-duty applications.

ENGINE ISSUE AFTER PREVIOUS REBUILD

Pressurizing cooling system

A truck came in pressurizing the cooling system less than a
year after another shop rebuilt the engine.

We found the root cause was never addressed. The block counter bores were below spec.

We corrected the issue properly and reassembled the engine without further problems.

ELECTRICAL & EMISSIONS FAULT

No DEF usage despite gauge reading

A unit showed no DEF usage despite a gauge reading.

Diagnosis revealed a failed after-treatment control module.

Module replaced, programmed, and system restored to proper
operation.

SAME-DAY TURNAROUND FOR FLEET VEHICLE

Canada Post unit coolant leak

A Canada Post unit came in with a coolant leak.

Radiator failure identified and replaced.

Unit was back on the road the same day.

AVOIDED UNNECESSARY $5,000 REPLACEMENT

Ford F350 misdiagnosis

A Ford F350 was diagnosed elsewhere with a high-pressure oil pump failure.

We found the pump was fine. The issue was a leaking seal under the valve cover.

Customer avoided a costly and unnecessary replacement.

TRUSTED BY BUSINESSES, FLEET OPERATORS & COMMERCIAL CLIENTS

Businesses depend on reliable repair partners because downtime affects productivity, scheduling, and customer commitments.

    
 
 
       Posted on Google  
   
   P Kula 
 
 
 
 Trustindex verifies that the original source of the review is Google. Peter helped me out, definitely recommend him for all your mechanical needs!
  
 
      Posted on Google  
   
   Kalberta 
 
 
 
 Trustindex verifies that the original source of the review is Google. Peter is amazing at what he does! Definitely recommend this shop!
  
 
      Posted on Google  
   
   D T 
 
 
 
 Trustindex verifies that the original source of the review is Google. Thank you to the team at Mr. Diesel for always going above and beyond to accommodate my requests and providing amazing work and customer service over the years. Bill and Stef have been truly amazing to deal with since day one and they will always be the first shop that I reach out to for any work I need done on any of my trucks!
  
 
      Posted on Google  
   
   C Johnson 
 
 
 
 Trustindex verifies that the original source of the review is Google. Took my truck here to get my A/C repaired, worked better than it ever did. My hats off to you considering the other company had it several days and couldn't fix it and you only took a few hours to get it working better than ever. Thanks again
  
 
      Posted on Google  
   
   S sidhu 
 
 
 
 Trustindex verifies that the original source of the review is Google. Honest at the heart. They know there stuff. They did a c12 cat engine rebuild about six month ago. Never had go back for the same repair twice.  Highly recommended.
  
 
      Posted on Google  
   
   Barry 
 
 
 
 Trustindex verifies that the original source of the review is Google. Perfect work!  I'm not from Calgary. My truck engine seized near there last November and I was in a bind.  I'm so glad that I used Mr. Diesel on a recommendation from another shop..  They found me a low mileage used engine and performed a complete swap.  In the almost year since, nothing has gone wrong relating to the work that they did.  Thank you Mr. Diesel.
  
 
      Posted on Google  
   
   G Bains 
 
 
 
 Trustindex verifies that the original source of the review is Google. Best heavy duty repair shop in calgary . Fair price and best service. 👍
  
 
      Posted on Google  
   
   D Group 
 
 
 
 Trustindex verifies that the original source of the review is Google. Honest fair and reliable what more can you ask from a mechanic

4.9 out of 5 stars

Common themes customers highlight include:

HONEST COMMUNICATION

STRONG DIAGNOSTIC CAPABILITY

RELIABLE REPAIR WORK

PRACTICAL RECOMMENDATIONS

LONG-TERM SERVICE RELATIONSHIPS

Frequently Asked Questions

What types of vehicles do you repair?

We repair heavy-duty trucks, commercial vehicles, fleet vehicles, diesel-powered equipment, and a variety of work-related vehicles used by businesses throughout Calgary and surrounding areas.

Do you work on fleet vehicles?

Yes. Fleet repair and ongoing fleet support are an important part of our business.

Can you diagnose complex mechanical issues?

Yes. We regularly perform advanced diagnostics and troubleshooting for difficult-to-identify mechanical and electrical problems.

Do you only repair diesel engines?

No. While diesel expertise remains a major strength, our repair capabilities extend well beyond engine work alone.

How long do repairs take?

Repair timelines depend on the nature of the issue, required parts, and overall scope of work. After assessing the vehicle, we provide a clearer timeline and recommendations.

What should I do if a warning light comes on?

Ignoring warning lights can lead to larger repair costs over time. We recommend having the issue inspected as soon as possible before additional damage occurs.

Do you perform emission system diagnostics and repair?

Yes. We diagnose and repair emission system issues on supported vehicles and equipment, including problems that may trigger warning lights, performance concerns, drivability issues, or operational reliability problems.

Keep Your Vehicles Working. Keep Your Operation Moving.

Mechanical issues rarely happen at a convenient time. Having a repair partner you can call when problems arise makes all the difference. Whether you're dealing with an immediate repair need, ongoing fleet support, diagnostic concerns, or planned maintenance, our team is here to help. Contact Mr. Diesel Inc. to discuss your repair requirements and get the support you need from a team focused on long-term reliability and practical solutions.