Just bought a 2011 TDI Sportswagon and at least for the first 600 miles, I'm tickled pink. This is my first diesel so I have a lot to learn and this forum seems to be a major source of reliable albeit diverse info. One thing that concerns me is the lack of history with this new engine design. Does anyone have a feel for the magnitude of the problems resulting form occasional use of LSD as opposed to ULSD ie; If it became necessary to run 3-5 tanks of LSD while visiting Mexico, would this have a significant affect on the motor or emission system?