Working on diesels was and is a losing proposition. When a shop is turning down walk in customers driving the run of the mill vehicles with common problems why bang your head against the wall. If it’s a Cummins or a Perkins or a Toyota bring it on. But those rarely need anything beyond water pumps and filters. The issue seems to be it is no surprise to me that many shops avoid diesels. Who makes the Jeep Liberty diesel, anyway?