bighatnohorse, if you take your 15 Ford in to Mexico and start using Mexican diesel there is a very high probability that you will see NO symptoms whatsoever. The vast majority of late model Fords experience nothing more than the Check Engine light on for periods of time between regenerations.
For those who have concerns, and don't like to see that Check Engine light blazing, all that needs to be done is to purchase a tuner such as the Edge CTS2, which can force a regeneration on a late model Ford diesel. Simply run a regeneration cycle on a regular basis and the emissions system will be kept free of sulfur deposits.
Please note that I do NOT receive commissions from Edge and I have no connection with that company.