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Latest Customer Testimonials & Reviews

We have worked with DES for several years and found their work and customer service to be top notch; anything from opacity testing, DPF cleaning, system repair and A-C repairs they get it done and done right. I would gladly recommend them.

Ron GwynnLead Equipment Mechanic - Washington Unified School District

DES performs all of our scheduled maintenance on our DPF units as well as our Preventative Maintenance. They are also our mechanic if choice when our vehicles break down. For over 3 years we have used DES exclusively and never had a complaint. They are prompt, courteous and well aware of our scheduling needs.

James NortonTrainer/Dispatcher Robla School District

At DES, we make it a point to have satisfied and loyal customers.

Service and parts that are above and beyond expectations is how we roll.

“Quality drives us”  – this is more than just a catch phrase. It’s the core attitude, belief and foundation of how we interact with our customers everyday.

The testimonies and reviews here are just a sample of the many satisfied customers we’ve been honored to serve in the diesel fleet maintenance industry .

We’d love the opportunity to add your story to the list!

More Testimonials

I have been using DES for several years for all of my DPF cleaning and maintenance needs and am very satisfied. Their staff is very knowledgeable and helpful; they usually diagnose problems quickly to get me back on the road.
I appreciate the friendly and supportive staff and how they consistently communicate about my orders. I highly recommend Steve and his crew at DES.

Kelly GranberryOperations Manager at Cross Petroleum

Diesel Emissions Service installs and services the DPF systems in our fleet. They provide quality service and are very knowledgeable on their systems. I would recommend them to anybody in need of DPF cleanings or system repairs.

Larry NobleShasta Union High School District

DES has provided us with excellent professional service since day one. They have a great selection of inventory including gaskets and clamps to finish each job. Every DPF we send them is returned cleaned, sealed and tested. Each cleaning comes with a report with test records, along with before and after photos of every DPF. DES is always willing to go the extra mile. Along with their great service, the turnaround time is second to none and Dave has even come in on a Saturday to help us out! I would suggest them to anyone.

Dan FunkParts Manager of McCoy Freightliner of Portland

Being a small private school with a fleet of only twelve buses, we didn’t have any clout with anyone, but Diesel Emissions Service made us feel we were important to them and gave us much assistance in bringing our buses into compliance. Whenever there's a problem with a system, or just a filter that needs cleaning, they are always there. I have called at some pretty inconvenient times and they have always come. DES has gone to great lengths to keep our buses running for us. That's my idea of service.

Jim SmithRio Hondo Prep