Tri-County Diesel Services

Tri-County Diesel Services deserves every bit of recognition I can give. From the moment I walked in, Office Manager Tori set the tone — kind, professional, and absolutely on top of communication. She kept everything transparent between me, Randy the mechanic, and my employer, Torpedo Transport Services. That level of clarity is rare in this industry, and it made me feel like my truck and my time actually mattered. I originally came in thinking I had a fuel‑supply issue. But Randy didn’t stop at the obvious. He dug deeper, followed the symptoms, and diagnosed the real problem — a failure inside the air compressor, an internal component that had broken down. That kind of troubleshooting takes real skill, patience, and pride in the craft. Most shops would have thrown parts at it or guessed. Randy found it. On top of that, he went through my battery box, identified damaged and disorganized cables, and took the time to replace, clean, and reorganize everything. When I opened that box afterward, it looked like a brand‑new installation — neat, safe, and done right. The shop itself? Clean enough to eat off the floor. Everything organized. Everything in its place. That tells you everything you need to know about how they work and how seriously they take their reputation. My truck was completed efficiently, correctly, and at a fair price — parts, labor, everything. I never felt like a number. I felt like a customer whose livelihood depends on honest, skilled people… because it does. There is no comparison between Tri-County Diesel and the big-name dealerships like RUSH Peterbilt. This is a small shop that performs big miracles. They take pride in their work, and it shows in every detail — from the front office to the last bolt tightened. If you’re a driver who depends on honesty, skill, and real communication, this is the shop you want in your corner.

If you are looking for great prices and the best service for your diesel truck in San Antonio, then look no further than Tri County! I came in for a pre purchase inspection. Where as other places charge $300 - $400 for just one inspection, I got two separate trucks inspected here for half that cost. The two individuals I worked with, Michelle and Randy, were both very kind and professional. They answered all my questions thoroughly when it came to describing problems with my unit and exactly how much those problems would cost. Tri County has an owner that cares more about quality of service than trying to steal every nickel and dime in your change cup. They are up front, honest, charge great rates and professional. Huge dirt lot with plenty of room to pull into and parking. Drivers lounge so you can get out of the 105° heat in Texas. Whats more to love? Check them out if you have any diesel related problems. You won't be disappointed!

These are really good people here. We have a shaking problem that’s hard to diagnose with our truck. They took their time and checked everything out and let us know everything they found. They spent time and didn’t even charge us since they couldn’t definitively say which issue was actually causing the problem rather than throw parts at it and charge us unnecessarily. They even referred us to another shop to do some of the things they don’t handle. This is a really good shop interested in actually solving your problem and not grabbing every dollar they can out of people regardless of whether the issue is fixed. They have earned my repeat business.

My dad has been coming here for years to get his 18 wheeler fixed. Truman has always been so good to our family. Michelle, the office assistant is really great and so nice! We will continue to come here for diesel service. ❤️

5 stars isn't enough for Tri-County. They are incredibly professional, friendly & honest. Shop & floors are SPOTLESS & not like the average black grease tarpit like were used to seeing. I had called shortly before closing & they got me in early the next morning. Managed to get me out by closing that same day. What would have been a logistical nightmare at the dealership ended up becoming a great experience here. I was exhausted from running all night & they were kind enough to let me zonk out in the sleeper, where as most places will tell you to tough it out. Pricing was very reasonable, especially when you're talking about high quality work & same day service on a all day mechanical adventure. (Good, Fast Cheap...Remember, you can only have 2). They also made sure to give everything a 2nd look before sending me out & the parts / labor was all broken down for you to see (unlike a few mom-n-pop shops) As for accommodations, they have a luch /break / waiting room with a microwave, table, snacks, coffee, nuts etc & thats a big plus. Furthermore, just a few hundred feet from them is a fantastic spot to grab some BBQ chicken or Short Ribs (Always helps when you're down for the day waiting to be get rolling) For those of you who have a dog in the truck: My dog Micah was with me as always & they treated her so kindly. Offered her water and treats (asked for permission first too). Was very happy to see this, as most shops avoid dogs like the plague & tell you to get as far away as possible. Folks, if your looking for a shop for an OTR deal or as your new local service spot... You've just found it.