Update regarding Diesel Fuel In Mexico

The engine to my knowledge loves sulfur fuel it lubricates the moving parts.

To my knowledge you are absolutely correct. The basic engine - block and pistons - hasn't changed much in forever. It is the other parts that have changed and various emissions parts in particular. Without using exact technical terms - there is a sort of filter - it is designed to accumulate residue from burned sulfur and then eventually burn it off as needed. So if you burn 500ppm fuel in one of these things (oversimplifying) designed for 15ppm it may have to work harder and longer to clear this stuff out by burning it. (Please don't jump on me about technical terms - I am intentionally not using them and don't care what they are). As stated above in this thread by the experts this may not be necessary if the engine is working hard and at high temperatures. But if it is not working too hard and is not heating up the device must go to work. My question has to do with whether needing to work harder could shorten the life expectancy of the equipment resulting in early replacement or repair? Nothing to do with the engine itself - but related to the engine the equipment is attached to. Would it seem logical to assume that adding more than 30 times more than the system is designed for could cause some problems over an extended period of time? Having been a trucker for 10 years and over a million miles - 48 states - and now driving my 06 Cummins powered motorhome for over 10 years as a fulltime RVer - over 130,000 on this one (30,000 to 40,000 in Mexcico)- all if North America - I know that things wear out and need replacing. I also know just about any part related to these things is not cheap - nor are repairs you can't do yourself cheap. I have heard of truckers having to replace these emission parts even when using ULSD and word is they ain't cheap.

When you mess with a computer system on any modern vehicle you are taking risks. We are not driving 55 Chevies anymore. These are complex machines. These are not catalytic converters or air filters you take off so your engine runs better (as if it really does). If you remove any part of the emission system you will have to change things in the computer. The computer sees all and knows all. Companies make claims about modifying these systems but is it worth the risk?

I have said many times I know nothing about any of this. I don't need to as we plan to keep our 06. Knowing nothing I have no advice to offer but if I needed advice I certainly would not be getting if from unknowns on internet forums. Asking many questions of the engine and related equipment manufacturers is the only way to find these things out. They may tell you not to do it but maybe they will also be able to tell you what "might" happen if you do things the system is not designed for. I do not mean how will it run. I mean will it have any adverse effects on components in the system over the long term and what might those things be and how much might it cost to repair? I have met enough local mechanics to know I would never base my decision on their advice. These are questions for engineers.

The original poster has been providing "information" on this forum for many years beginning way back when we first heard of ULSD. After all these years I still have no idea who he is or what his credentials are or exactly how he has compiled all his database of information. He may be the world's foremost authority and expert on this topic. I have no idea. I think I have read every one of his posts over the past almost 10 years and still do not know any answers. At least not the answers I would be asking questions about if I owned a newer vehicle and was considering putting incorrect fuel in it. Over the years we have heard from him about people who have had problems and people he has trained how to deal with the problems.

I recently posted on another thread about some of the very basics of electricity and with my posts I provided links to websites with specific information about electricity. Even though the US Navy trained me in electronics with the first 6 weeks of a 6 month course just about basic electricity and I have wired and rewired houses much of my life I still do not claim and have never claimed to be an expert. But the laws of electricity are pretty much set in stone and no one who knows anything about electricity would ever argue that point (physics). Yet we do get those on this forum all the time who argue about just about anything - some would certainly say I am one of them. I try to find facts and provide sources of those facts and almost always get my facts from very solid sources that are known - National Electrical Code. I provide links. I like facts. Opinions - not so much. Supposition? Speculation presented as fact? So as far as ULSD and LSD I would want facts supported by more facts from a number of experts. That's just me.

It could be totally fine to take a newer vehicle to Mexico and I certainly encourage people not to miss an opportunity to visit Mexico any chance you get. But be informed. Get the facts. Ask the questions. Know before you go.