The Diesel Mechanic's Confession: What Every Duramax, Powerstroke & Cummins Owner Needs to Know. The Diesel Mechanic's Confession: What Every Duramax, Powerstroke & Cummins Owner Needs to Know By Westco Automotive & Truck Repair | Colorado Springs I've been working on diesel trucks for over a decade. In that time, I've seen the same heartbreaking scene play out more times than I can count. A customer walks in. Their face is pale. They just came from a dealership. The esti