There are lots of diesel vehicles used in Mexico - buses - trucks - and lots of diesel mechanics. But you don't see diesel pickups in Mexico very much. One of our RV friends has a Ford pickup with a diesel and we went to the Ford dealer near Guadalajara and they had parts and mechanics to work on it. But one of the problems is that Mexico does not have ULSD everywhere yet - if at all. Many RVers do take newer diesel vehicles to Mexico - even though these vehicles require ULSD. I think maybe the jury is still out on what the consequences might be of using inappropriate fuel. I think there are many factors. The newer diesels have pollution control devices to keep the air clean but these devices are designed to clean fuel containing only 15ppm of sulfur while LSD fuel may contain as much as 500ppm. If you put 20 to 30 times as much sulfur into one of these devices it needs to clear the sulfur more often. I don't know the technical answer but I understand these things heat up to high temps to burn the sulfur. If there is 20 to 30 times as much sulfur would the regenerator have to burn 20 to 30 more times? No idea. So if it burns more often will it wear out sooner? No idea. How much does a new one cost? No idea. Where can you get one? No idea. These would all be questions to ask the manufacturer of the vehicle - and no one else - the engineering dept at the manufacturer and not the dealer or local mechanic. That said - we have never been anywhere in Mexico where we could not find diesel fuel and we have never gotten a bad tank of fuel. If you buy an older diesel prior to 2007 you will not need the ULSD.