Looking to find out what I can about the package cars used. I've been a mechanic for about 25 yrs & working on becoming one with UPS. My background is from the automotive & lg. truck field. During this time, I've worked on all types of diesel/gas engines & their associated problems. Just haven't worked on package cars. What are the most common problems you mechanics find with them? What engines are used? Are you doing more PM work than large mechanical work? Just trying to figure out what I'm getting into if hired. Any help appreciated. Thanks.