A search of this, and other forums on the net, will show that the same group of naysayers has been attacking my posts since 2007, but not a single one of their dire predictions has ever come to pass, because the science is on my side, not on the side of the naysayers.
I'm only going to respond ONCE to negative comments - here are my responses:
1.
Technicians at dealerships generally have very little depth of knowledge about the way that DPF/SCR emissions systems operate - they can't be expected to have depth of knowledge because it is not necessary to have that knowledge in order to do a decent job.
2.
It is true that DPF clogging was an issue in the earliest years, mainly 2007.5 through 2010, when regeneration cycles did not properly burn out the soot when vehicles were used in stop start urban driving situations. Those problems have been overcome using improved regeneration programming. Also, those early clogging problems had nothing whatsoever to do with sulfur in the fuel, of course.
3.
Increased concentrations of sulfur in the fuel do NOT cause more frequent regenerations. In fact, sulfur compounds deposited in the DPF because of the use of Mexican fuel are never an issue. It is sulfur poisoning of the SCR in 2011 and later vehicles that can SOMETIMES make it necessary to force an early regeneration. There is, however, an enormous variation in the average miles between regenerations, whether or not LSD is being used. Regenerations can occur as often as 250 to 300 miles on some trucks, or may not occur for almost 800 miles, depending on the type of driving and the load on the engine, amongst other things. This means that the occasional forced early regeneration while in Mexico has an undetectable influence on the average miles between regenerations over the life of the DPF. In other words, it is not worth even considering the impact.
4.
Of course everything eventually wears out, but DPFs last a very long time, and can be serviced at some point around 150,000 miles to add life extension. Whether or not there was more or less sulfur in the fuel from time to time is irrelevant to this life expectancy.
5.
Bottom line is, there is not a scrap of evidence to suggest that the occasional use of higher sulfur diesel fuel in Mexico causes a decrease in the life expectancy of a DPF, and neither does any theoretical consideration of DPF function support such a suggestion.
