Ok let me confirm what was already stated regarding the 6.7 and foreign fuels. Yes the 6.7 with a DPF delete will run on any type of diesel fuel. It is recommended that an EGR and cat delete be done as well, but not required. The common rail injection system will have no trouble with the various fuels AS LONG AS THEY ARE PROPERLY FILTERED! If one wants to take one of these on international expeditions, an upgraded fuel filtering system is a must. Companies like FASS and BD diesel have excellent kits with large capacity filters that are easy to change out and can be purchased at any John Deere dealer.
On to the subject of the truck itself since we all know the Cummins is as reliable as the sun I wont even elaborate on that one. My experience with the rest of the truck (cab, transmission, frame, axles, brakes, etc.) has been with 5 different trucks of various years from 1990 to 2005. The one thing I can say without hesitation is this, the automatic trans has always been the weak link. This may not be the case any longer as I have no experience with the 68RFE trans. We have always owned manual transmissions and have had only one problem in over 1.5 million miles (cumulative). The cabs have improved immensely and starting in 03 were very well made. My dad's current 2005 has 180k on it with tons of offroad use and it doesnt have a squeak or rattle anywhere in it. My understanding is that the 2010+ is an even further improvement and from what I can tell on a test drive it is the most solid and comfortable so far. Dodge however decided to not offer the quad cab in their HD trucks as of 2010 so that kinda sucks. The frames have always been unbelievably strong and the loads that we put on our old 2002 work truck should be illegal (hasnt failed yet). Current axles are proven AAM components with ARB air lockers available for front and rear. Ball joints in the front are the one known weakness, but can be replaced with upgraded stuff when the time comes. Brakes are as good as any other truck out there, and with the true exhaust brake on the Cummins, last a very long time even with heavy towing. The downside is that Dodge brakes have always been know for high dust. This can ruin expensive wheels and just be a PITA to keep looking clean. I recommend EBC greenstuff pads to remedy this.
All said, I will be ordering a 2012 most likely tomorrow, so my decision has been made. I hope this didnt come across too biased as I am quick to admit that when shopping for a new HD truck, there isnt a bad one in the bunch. The 5.9 is always preferred, but I can swap out emissions stuff every 2 years without too much problem. For me that is really the only compromise I had to make when comparing the 5.9 to the 6.7. Hope that helps.
