From Ed White:
Good Morning Paul,
I haven't checked lately, but Chevron Mexico's website used to carry the message that their diesel fuel is DUBA. (Note Arco is all DUBA)
In any case, at this stage:
1.
Nobody has reported to me a single verifiable case of sulfur-in-fuel problems since April of 2018.
2.
The three or four third party reports I have received related to emissions light warnings over the past 18 months have all resolved themselves, except for one, which suggests that fuel was not the issue. In the case which did not resolve itself, I managed to communicate with the owner. The problem turned out to be a faulty NOX sensor.
3.
Diesel Exhaust Fluid (DEF) was first introduced NINE YEARS AGO, and those nine year old trucks are beginning to experience NOX sensor failures and intermittent misbehavior simply due to aging, not the fuel. So, it would be helpful to note the model year of vehicles exhibiting emissions system warnings when trying to determine what caused the problem. The older the truck, the more likely it is a component failure.
4.
The lack of proven fuel related problems since April of 2018 suggests to me that Pemex is diverting most or all of it's LSD to shipping, electrical plants, and bulk purchase industrial customers, not the retail automotive segment of their market.
5.
The entire Baja appears to be continuing to receive exclusively DUBA. There are a LOT of Snowbirds down here with late model diesels, including me, and there is no sign of any issues. The last samples I took, admittedly a year ago, were DUBA for both northern and southern Baja.
6.
One way to determine whether a station is receiving DUBA is to get a look at the delivery manifest documentation, if they will show it to you. The document WILL list the diesel type delivered on the last top up.
Regards
Ted
