One guy i know says you cant buikd an engine in a garage.its too dusty. I almost agree, but he was an aircraft engineer.
Totally sterile,and sanitized (so to speak) engine parts will make for a long lived engine, but i consider the enviroment i drive my vehicles. Dusty gravel roads. Lots of them.
What about opening up an engine to repair it? Think the dealerships have a designated clean area to perform major surgery on a less than one year old diesel engine?
I can tell you no. They may do their best to clean,and assemble with good practices but it is done in the service bay.
