Seeing as Urea is very common world wide as a source of nitrogen in fertilizer I would think that a "home brew" solution to this problem would be an option.
This discussion started full of hot air and has headed into the toilet! Exhausting!
Bad puns I know.
Jonathan D. Howell
Lieutenant Colonel, US Army
EarthRoamer XV-LT #15 "Around the World"
"Americans travelling America"
Life Memberships: National Eagle Scout Association, Veterans of Foreign Wars, National Rifle Association, Military Officers Association of America, Army Engineer Association, Good Sam Club, North American Hunters Association...if I could: EarthRoamer, Overland Journal and ExpeditionPortal.com
it does freeze/ get too cold to work. Our new truck has a 5 or so gallon tank and lasts about 3 days at 1000 rpm. we work in the oil feild and can spend many days on a rig sometimes running our hydraulics and generator at a set RPM. sometimes our trucks sit work for months stright with just a few mile trip every week or so to move to another well site. I have been up to north dakota and herd many complaining about runing in limp mode for long periords because of frozen fluid in their pickup trucks. Most places do not see 20 or 30 below on a consistant basis like we do though.
2009 GMC 1500 ex cab All Terrain: lights, rack,
1960s Mitchell slide in: solar,hydraulic lift
toy: 72' wagoneer 6in lift, 33" MTR, transplant in progress: lsx and 6l80e
Seems like some heating tape on the supply tube would fix the freezing problem. Or perhaps a espar/webasto heater would work by keeping the engine water temp up. If the engine doesn't reach full operating temp it can't be happy.
As far as getting adblue, just have a case shipped. Maybe a family member could ship mail with it.
But I agree the problem for world travel isn't the adblue, but ULSD. The solution to ULSD may eliminate adblue. There are still states that don't do emissions testing, so there are companies that produce "off road" kits.
If all this is too much buy a vehicle 2006 or older. "Offroad conversion" or used are the two choices.
X2 to cwsqbm's comment on the absence of ultra-low sulfur diesel south of the border.
Running a newer (2007-present) diesel engine on high sulfur fuel is definitely a bad idea. While the engine will run on the old style diesel, the emissions control systems will be damaged. The diesel particulate trap, in particular, is likely to get gummed up to the point where it will increase back pressure in the exhaust, making the engine run poorly. Replacing the DPF is expensive. In addition, running your vehicle on the old diesel fuel will void the manufacturer's warranty.
If you know that your travels will take your vehicle to Mexico and points south for an extended period, I'd look for a vehicle with a 2006 or older diesel engine. Or consider buying a new vehicle in a country where ULSD is not yet required.