STL Diesel, established in 2011 in Crystal City, Missouri, is a family-owned and operated shop known for its expertise in diesel services. They specialize in DPF service and cleaning, diesel performance, modifications, and add-ons. The shop is celebrated for its honest and high-quality work, performed by trained technicians using the latest diagnostic and service equipment. Customers appreciate that STL Diesel can repair issues that other shops cannot, such as diagnosing faulty injectors and fuel in coolant, and successfully clearing trouble codes on diesel trucks. The team is known for excellent workmanship, great customer service, and fair prices. Many clients have praised the shop for their quick and reliable repairs, even when dealing with complex problems. They are also willing to go the extra mile, fitting in urgent work and providing detailed pre-purchase inspections. Overall, STL Diesel is highly recommended for diesel needs, with customers trusting their knowledge, professionalism, and fair pricing. The shop’s commitment to integrity and customer satisfaction has earned it a strong reputation in the community.
Got my 2002 2500 Cummins back on the road. Shop is very transparent about what can & should be done. They performed thorough diagnostics before throwing parts at individual problems which is all too common in today’s automotive repair industry.
July 2026
They diagnosed the truck quickly and got all the work done faster than expected. Truck drives like it did before it was lifted
July 2026
Great Experience! STL Diesel- They are professional and did a great job on our vehicle.
