The bottom line is that Euro VI heavy duty emissions in terms of g/kwh are:
NOx 0.4
PM 0.01
EPA 2010 in terms of gm/kwh
NOx 0.27
PM 0.013
Close enough that we MIGHT see some Euro engines again after 2010. Daimler was mumbling about bringing the U500 back to North America again after 2010. They're going to have to have a version of the 900 series engine for Freightliner trucks at that point; they are fairly committed to it by now with 2007 emissions, which gradually trend into 2010. The big jump for Euro is V to VI in 2013 or 2014; the big jump for EPA was 2007.
Of course they sell 200/week or so 900 series motors in Freightliners and they were selling about 1 U500 a week when they pulled it out.
I have been doing a LOT of internet research the last few weeks regarding emission specs with regards to motor oils. It is my considered opinion that one can travel the world with a new truck with DPF and SCR and even use high sulfur fuel, but 2 things will be needed:
1) if CJ-4 lube oil is used oil change intervals will need to be decreased, because CJ-4 oil has less alkaline reserve to neutralize sulfuric acid buildup in the oil. CJ-4 motor oil might not be available everywhere but a lube oil change can be carried and ACEA E6 or E9 oil is very similar.
2) The expensive catalysts in the SCR and DPF will be damaged more quickly, depending on how much high sulfur fuel is burned. I would guess that a 40-50K mile trip would be feasible, maybe much longer, considering that sulfur contents in fuel are dropping worldwide. That's assuming the equipment is new at the beginning of the trip.
3) It might be possible to take the truck out of limp mode with the appropriate computer but it might be necessary to do a computer manipulation EVERY time the truck is started.
4) I don't know about running out of urea solution; that could be a BIG problem, maybe there is a computer workaround for people travelling outside the EC/North America. It would be a real pain to carry 50,000 miles worth of urea solution. Maybe a bag of powdered urea, the solution is easy to make, it's 33%??
All in all I'm glad my engine just has "low EGR"
Charlie