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Yeah, I'm agreeing with Dave on this one. Paccar is out to lunch on that one.
The ISX15 is ALWAYS in an aftertreatment warmup state (VGT nozzle fully closed to create lots of backpressure and help build heat quickly) when the engine is idling and the coolant temp is below ~150F. Easy to tell because it sounds like a giant vacuum cleaner. Driving during this time will not hurt anything. As soon as you step the throttle, the engine reverts back to "normal" anyway.
I deal with ISX15 engines in Paccar products on a daily basis on the service department side of things. Your citing of the manual is the first I have heard of this.
And don't worry about regenning near combustibles. Exhaust out temps are much lower on SCR engines. Besides, it will never regen when the truck is stationary and you haven't forced a regen with the regen switch.
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