Daryl came highly recommended by another diesel shop in CA and I can see why. Daryl (owner/president) and Bob (manager) were familiar with the Ford 6.0 diesel problems and the appropriate solutions to make the engine reliable. That's just what I need with my Excursion and that's what I received. In addition, they have performed so many of these repairs on 6.0s that they have become efficient and only charge for those parts and repairs that are absolutely necessary and pass these savings on to the customer. They replaced my engine oil cooler at half the price that the dealership quoted me. Gentleman, thanks for a job well done. Recently, DIesel Specialists diagnosed a faulty fuel injector and I expect that my experience will be similar this time. I highly recommend Diesel Specialists.