ULSD

I would allow GM diesels through 2009.
I would allow Ford diesels through 2015
I would allow Dodge diesels of any year

NOTABLY - these are all pick-up engines - no big engines in the bunch.

I would very much like to know the total number of vehicles and engines included in all this statistical analysis and database etc. Is this all totally and specifically based on information provided to the author of this study by those who have traveled in Mexico in recent years and have known about and contacted and participated in this study? What are their numbers? How many participated? Is this study published somewhere? How does it compare with any similar studies done by the actual manufacturers of these engines and any feedback they may have received from owners who may have had problems and contacted the manufacturer directly without any knowledge of the above mentioned study? I think personally I would want to know what assures us of the credibility of the author. I have no idea. He may well be the world's foremost authority. But how do we know that? In no way do I intend to condemn this study or it's author. But is there any other such study published somewhere where readers of this forum can get all the information and data they need to make a truly informed decision about this potentially expensive trip they may be considering?

To be clear - I very much want everyone and anyone who is interested to visit Mexico and to explore the country in their RVs to learn more about what a truly interesting country it is. What I do not want to see is a bunch of uninformed people visiting Mexico and having a bad experience because they did not do their homework and had a bad experience - or an expensive experience - which they then post reports about to bad mouth Mexico and cause others not to visit because these people did not do the research. Find out what to expect and don't blame Mexico if you were not prepared for what you might expect.