Who in the hell needs to get 350,000 to 400,000 Plus miles out of an engine and vehicle anyway????
Ok, I just checked with the our vehicle maintenance manager. He's in charge of over 1400 vehicles at 6 garages. Most of the diesels don't get rebuilt until they hit 500K miles.
I'd put the maintenance program up against any in the country as well as the documentation systems they use. Some of them are updated daily by a gps system when they're parked for the night.
Valve cover gaskets isn't even on the list of hundreds or things that are on the maintenance list to check. A grand total of ZERO vehicles have this as a preventative maintenance item. ZERO.
Also, in this position for 28 years, they've never encountered heavy fire, where they thought the maintenance program was going to be an issue for safe return to the garage.
