I would recommend these guys to anyone... they helped me in a big pinch. I drive 8-10 hours every other day for work... so I can’t have my truck out of commission for more than half a day. My truck emissions started having problems at the end of my drive to CO and that required instant attention. No dealers would take me for over a week. They told me to come in right away, and they got me taken care of instantly! Near closing time too... super kind people. Great service, fantastic team

Great service, excellent work, highly recommended!Based on a recommendation from a friend, I brought my 1969 Pontiac Custom S to Gas and Diesel Garage in Longmont for much needed upper ball joints and front drum brakes. I have to say Im very impressed with this shop and staff.Monica at the front desk is awesome to work with! Shes very responsive and thorough and she makes sure your requests/concerns are well understood. The mechanics do top-tier work and it’s done in a timely manner. Parts and labor were reasonable and the results were great, especially for a 50+ year old car!This is an open, honest and up front shop. They simply “do the right thing” and there is a sense of pride in their work.I would highly recommend Gas and Diesel Garage and plan to have future work done there as well!!

These guys (and of course Monica) were prompt and professional. Ive been having underlying issues with my 2017 gmc 3500 and was struggling to find a local diesel mechanic/shop I could trust. It’s like going to a new barber 🤷‍♂️ BIG shout out to Joey for diagnosing/fixing my exhaust and glow plug issues. I’ll be back, hopefully not for the trucks sake

Great shop! Promptly addressed our issues which were a warranty issue from new parts failing on work done at a different shop. Monica and the whole team took care of everything from contacting the warranty company to setting up the tow and talking to the previous shop that had worked on our 2002 F350 7.3 diesel. Thanks for the great customer service!

GREAT SERVICE!!!!!!!!! ITS HARD TO FIND A SHOP THAT YOU CAN TRUST TO DO THE JOB RIGHT THE FIRST TIME THROUGH. I DRIVE CLEAR FROM CALHAN, COLORADO A 3 HOUR DRIVE BECAUSE I TRUST THEM. LOVE THESE GUYS.

The best! It is hard to find a great mechanic shop that will do quality work at a good price. Gas and Diesel is honest, upfront and have been consistently the most reliable mechanics I have had for my Nissan Xterra and Subaru Outback. Plus my dog loves them!

I am a hot shot truck driver and I needed the rear end replaced in my truck ASAP. No one would even get near it. These guys did. I dropped it off late Friday evening and they got started right away. They sent me updates, photos and even loaned me a vehicle. They called me the next morning and BOOM it was done already. They were absolutely amazing and I was back on the road the next day! Thanks again guys! You’re amazing!

Always fast, professional and friendly service! The guys in the shop are upfront and honest with what actually needs to be repaired, and Monica at the front counter is always friendly! Wont go anywhere else!

They came highly recommended, we take all our work trucks to them and personal vehicles. They are able to figure out any vehicle we bring to them and they are always fair priced. would absolutely recommend them!

Great shop, staff, and customer service! Gas and Diesel Garage is very professional and there is no other place that I would take my vehicles too! Keep up the great work!Sincerely, Mike Coulon

I love taking my jeep to Gas n Diesel! Monica is the best behind the desk and Steve and the rest of the crew do an amazing job on my jeeps. I have 3 jeeps and wouldnt trust anyone else with them! Great job Gas n Diesel!

Hands down best place around town to get your truck fixed. I had an issue with one truck that two other mechanics shops could not figure out and these guys had it solved in a day.

My husband and I needed work done on our 2nd gen dodge diesel when visiting the front range.. Gas and Diesel Garage provided excellent and responsive customer service, extensive knowledge and top-notch service.Its as good as it gets. Very highly recommended.

This place is absolutely amazing! Joey and his crew are great at what they do. Ive taken my 2015 Chevy Cruze to this garage two times now. The first time was in September, I had no idea what was wrong with my car and they were able to get it in right away, fix the issue and do an oil change within 24 hours of receiving it. The second time was today 11/21. I noticed my car overheating and the heater wasn’t putting out hot air and I panicked as I am going out of town this weekend through next week for Thanksgiving and need my car. I got in touch with them first thing this morning dropped my car off and in less than 6 hours they had my car fixed and running great again, and NO overheating! They are honest, reliable and affordable, way better than any car dealership or corporate shop. I will recommend them to anyone I know and won’t take my car anywhere else. You will not be disappointed with them!

If you want honest work by an honest owner this is only place you need to go to

Great staff, honest mechanics!! Wont take my vehicles anywhere else. These guys get it right the first time! Trustworthy, reliable and efficient.

Tyler and everyone at Gas and Diesel were extremely helpful. We have been truck shopping and wanted our diesel to be looked over before we purchased it. We brought it in at 4:15pm without an appointment and they looked it over for us immediately. Within 20 minutes they had a list of recommended maintenance and issues they noticed. They also shared with me their opinions on various diesel trucks. Couldnt recommend them enough.

I am very thankful that I was able to find a shop like this! The guys down here are very honest, and they will go out of their way to provide the best customer service. I highly recommend using them for your gas and diesel needs. No matter if I bring my car, or truck in I know it will get taken care of the right way!

Cannot recommend enough. They go above and beyond, are so helpful and do an amazing job at a fair price! Trust them 100% every time!

Was the best day of my life, I went in for an alternator and left with a whole new turbo setup. Didn’t take long and now I’m on my way spoolin to the next level all due to Gas and Diesel. Thank you guys, I’m finally becoming a big dog.

My mechanic retired and I never thought I would find a shop that I could fully trust until I found this shop. I 100% trust this shop with both my trucks. The people, pricing, work, and timing has been top notch on every visit. They will always have my business!

The best mechanics in Longmont I use these guys service for my personal cars in my business trucks good service

My 2006 Ram 3500 with 5.9L Cummins had an injector problem. The guys at Gas and Diesel Garage quickly diagnosed the problem and had my truck fixed the next day and running better than it had before I had the problem. They are knowledgeable, fast, and reliable. They are definitely good with Cummins IMHO. Highly recommend!

Tyler seems honest and knowledgeable. I feel like they do good work.

Joey and the rest of the crew got my car in and out in no time. Great shop, reasonable prices, and very knowledgeable staff.

Joey is amazing and really went above and beyond any of my expectations! Great place with great service and I highly recommend to anyone.

The best diesel doctors west of the Mississippi

Came here and got an oil change quick and easy. Great work!

Honest, friendly, and professional service from start to finish. I had tried to troubleshoot my problem and after a few attempts brought it into the dealer to be fixed. The dealer said theyd have to redo all work I did myself to make sure it was done correctly and then perform some other tasks for extra money. So naturally, I left and called Tyler. he set me up with an appointment at the Gas and Diesel Garage for Thursday afternoon. I showed up on time and Tyler had been waiting for my vehicle and myself to arrive. He patiently listened to my issues and broke down the list of services they would perform. I left knowing exactly what to expect and with a spot on an estimate of general cost. He called with updates as needed and never once pressured me with unneeded services like most of the Longmont auto shops do; as he knew I was a student just trying to get my car registered. He figured that it was a just disconnected sensor causing the check engine light, an easy fix this business had alleviated a whole lot of stress before it was even time for lunch. tyler seemed like an honest business owner and i can tell he cares about his customers and their vehicles. The Gas and Diesel garage is my new go-to auto shop these guys are the best.

Great service, Honest staff and affordable pricing!! I won’t take my vehicles anywhere else!!

Always does a great job! Friendly and trustworthy.

Love these guys and love their work. Solid. Thanks!!

Very friendly and knowledgeable staff, high-quality work conducted in a timely fashion. I highly recommend the guys at gas and Diesel garage.

Top notch from price to service everything is the highest quality you couldn’t ask for better mechanics. They are the only ones I would trust with my truck.

Great service, reasonable cost

Great people and great service!

Did quality work at a good price

Great job and good service