A member of my team just returned from 2 weeks in Japan, and went to a similar shop for ramen. She had to show up midday, get a ticket, and come back...
I immediately recognized my stupidity. It ended up being $900 because I wanted both fuel filters replaced and the system flushed from the engine back...
I'm not knocking diesels, they are right for hauling heavy and with continuous use. What they are NOT for are folks who want a big bad truck to pull...