Originally Posted by jsabatinos
At ConocoPhillips here in Billings MT, the premium diesel label also states -15 pour point. When asked, retailer stated that the current diesel was not -15 and therefore was not the premium diesel.
He would probably have meant 15 ppm (parts per million) sulfphur. Before 2007 most diesel fuel contained around 500 ppm sulphur. By 2010 the content had to be reduced down to 15. Better for our environement...
Some dyed fuel, mostly meant for farm, may still contain more ppm's.