You will never see
us arriving
at a job sight
loaded with
5 gallon buckets
of rusty tools
attempting to
"wing it"

— Mark Armstrong

Customer Testimonials

“A great resource. Mark Armstrong is extremely knowledgeable in all aspects of alternative fuel and diesel mechanics. His mobile rig has every tool imaginable to complete any necessary repairs. Because he is only working on your vehicle, not in a garage, I found you really get 60 minutes of repair work every hour. Mark was very straightforward and talked me out of doing some work he thought unnecessary. I highly recommend them and will use Mobile Diesel Medic for my next service.”

“Wow, I rarely write these things but they really saved me. The CHP wanted to tow my tractor and they showed up with two brief cases of different air brake fittings. Got me back on the road in 90 minutes. Thanks!”



“I recently contracted Mobile Diesel Medic to inspect a truck in Hayward (far away) for me before I purchased it for my business. Mark and his team were the only crew I could find in the Bay Area willing to go all the way out to Hayward and do a thorough inspection. Throughout, my experience with these guys was exceptionally friendly and professional. I was never concerned that my money wasn’t being well spent, they told me exactly how long they had been working and what they had been doing, and in the end they gave me a detailed, prioritized list of the problems I could expect to encounter with the truck, complete with a high-end, low-end assessment of what I could expect each repair to cost. Then Mark took the time, repeatedly, to tell me what the report meant, and even gave me advice about how to negotiate with the vehicle’s manufacturer. Since I am purchasing the truck, I will definitely be calling Mark and his team in times of need.”



“I have known Mark for over five years and worked with him while he was teaching at Santa Rosa Junior College. Mark is one of the most knowledgable and talented heavy duty technicians I have met. Mibile Diesel Medic may not be the cheapest mobile service around, but their prices are certainly within industry standards and for what they bring to the job, I consider their prices low. Mark put a lot of effort in training his techs and stands behind everthing the company does. As a former shop owner (25 years in business) I have seen some of the best and some of the worst. Mobile Diesel Medic stands out as one of, if not THE, best run operations I have encountered.” – Ed Ristad, Faculty member of the Industrial Trade Technology Department at Santa Rosa Junior College.



“We have a small fleet of seven moving trucks that Mobile Diesel Medic has maintained for ten years. We figure they have performed over a hundred oil changes, plus all our repair work, and box repair and welding (sometimes three in the morning). When updating our fleet there was some concern we would start having to schlep our trucks over the Bay Bridge and go to the dealer. This would mean two vehicles, two employees driving and two trips. Luckily this has not been the case. Mobile Diesel Medic has been on top of keeping their service trucks updated with all the dealer software. They can plug into our 2010 Internationals just as easily as the dealer and at a better rate to our company. No one compares to Mark and his crew, and we can’t recommend him highly enough!!” -Paul Dubois Wolfgang Matt, Owners One Big Man One Big Truck Moving Co., Inc. San Francisco Ca



“American Medical Response operates a fleet of emergency ambulances in San Francisco for the 911 system as well as local hospitals, nursing facilities etc. Our in-house maintenance is situated 15 miles away at another site. Mobile Diesel Medic has saved us at least 5 times over the last 2 years by providing a quick response to diagnose and repair sudden vehicle failures, provide preventive maintenance between shifts and, on one occasion, diagnose and repair a complicated electrical fault in an ambulance body that had eluded everyone else. Mark and his team do work of the very highest standard and their customer service and follow-up is unparalleled. Whether for pre-scheduled work or out of hours emergencies, we find Mobile Diesel Medics to be excellent value and recommend them without reservation!”



“Our company’s experience with Mobile Diesel Medic was top rated. They came to our warehouse for an emergency top end engine rebuild the day before Thanksgiving and worked through the weekend. The repairs were completed exactly as scheduled and Mark called every morning with updated progress reports. The final cost was cheaper than the estimates of the competition and MDM even took the time to make a couple of other minor repairs while they were there. I have been managing our company fleet for over 3 years and this is by far my best experience with any repair shop. We will definitely be using this company for all of our future truck servicing and repairs.” – Mohr Solutions Power



“We called Mobile Diesel Medic out of the blue from an internet search. When you do this, you are shooting in the dark when it comes to quality. We have been amazed with the work done by Mark Armstrong and his team of guys on our very unusual mobile 106′ hydraulic lifted tower. I would not hesitate to recommend Mark and his company for your unique or not so unique mechanical or hydraulic system needs.”

we repair trucks throughout the sf bay area

san francisco • oakland • san jose • san mateo • south bay • marin • san rafael • north bay • east bay