First let me start by saying, I am not the type of person to leave any business a negative review unless it is absolutely deserved! This review is not in any way directed to the salesman who frequents our area or the guys working the counter! They have always been very pleasant and helpful. This review is directed at the branch manager and the companies' quality control and testing departments. Our company has been doing business with D&W diesel for 15+ years and I have to say they treat their customers very poorly when it comes to warranty issues! Our last "and final" experience with D&W was approximately two months ago. I purchased a set of remanufactured fuel injectors for a 2004 5.9 Cummins diesel along with a set of their brand new connector tubes. We are not "green" to replacing injectors in these common rail systems and are fully aware of the necessary precautions that must be taken to avoid any contamination of the new fuel injectors! As with all vehicles we repair, we performed full diagnostics on the truck prior to condemning the original parts. We determined the truck needed at least three replacement fuel injectors but we always replace them as a complete matched set along with a new set of connector tubes. Once I had customer approval I called D&W with the engine number to assure I would receive the correct parts. The salesman that I usually deal with was very helpful and personable as he always is! He is a five star employee as far as I'm concerned! I received the injectors and tubes the next day and we brought the truck into our shop to perform the repair. My highly trained star diesel technician disassembled the engine and removed the connector tubes and injectors. He then inspected and cleaned all of the high pressure fuel lines, common rail and fuel filter housing cup of any contaminants. He then began the reassembly procedure, everything was spotlessly clean and the injectors and tubes were installed using the correct Cummins installation procedure, including all torque values specified by Cummins! We installed a new Wix fuel filter in the filter housing, primed the fuel system and started the engine. Within ten minutes of running we knew something was very very wrong! The truck smoked like a train and the engine ran rough. Using our scan tool, we were able to isolate the suspect injectors and determined that four out of six injectors were over fueling the cylinders. We contacted our salesman and he requested we remove all of the fuel injectors and he would pick them up to be analyzed. He picked them up as promised and sent them to their "clean room" for testing. Our salesman called me two days later with the results of testing, he told me that the injectors were full of dirt from contaminated fuel. I expressed my doubts to him as we had spent a great deal of time making sure everything was spotless and he told me his hands were tied. D&W diesel refused to offer any help except to sell us another set of their "poor quality" injectors from their so called "clean room". I told them they could keep their injectors as cores and reluctantly paid the invoice so our credit would not be damaged. I then ordered a new set from Tim at Accurate Diesel along with new connector tubes.Tim is a really great guy and he is extremely helpful! I received the parts two days later and my technician repeated the installation procedure. The engine runs excellent and we were completely satisfied with his product! I have since purchased many more injectors from him and many other products from Tim including injection and cp3 pumps and have nothing but positive feedback for him! We are now exclusively using Accurate Diesel for all of our diesel fuel system parts! I hope this very truthful review was helpful!