400,000 miles?
This truck has just been broken in.
I drive P & D for UPS Freight.
The asigned tractor I have is a 95 Volvo with 989650 on the odometer and its still running just dandy.
I've seen some older Overnite Volvo's at my terminal that turned the odometer over and are still running fine,on their second million miles.
The trick is the upkeep,change the oil,filters,with a PM every three months,drive it like you owned it,and you'll have a very reliable power unit for a long time.
I'm going into my 44th year as a local driver,20.2 Teamsters all the rest non-union believe me I've driven some real junkers for many different companies over that time.
This old tractor I have now is like a caddy compared to some of the DOT rejects that some of the LTL freight companies used to run back in the day.