Mr. White is a well-respected authority on diesel engin. The following is a verbatim text of an email he sent me on Sept. 27, 2018. The short version is, YES, you CAN drive diesels safely in Mexico.
It's that time of the year again - Snowbirds are preparing to head south for the winter, so it's also time for me to post an update regarding the availability of Ultra Low Sulfur Diesel (ULSD) in Mexico.
Drum roll please, because this looks like it will be the last time I have to post an update. The diesel fuel at all of the retail outlets in Mexico is now ULSD, meaning that the days of pumping high sulfur diesel fuel in Mexico are over.
All of Pemex's diesel producing refineries have been updated with desulfuring plants and Pemex is listing all of it's diesel production as ULSD, 15ppm or less of sulfur. You can see the information in the first paragraph at this Pemex link:
So, after more than 10 years on the job, it's finally time for me to retire from assisting owners of late model diesels with sulfur-in-fuel problems.
Have a great winter in Mexico
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