Diesel fuel used to have 3000-5000 ppm sulfur back in the day. In the 90’s it was regulated down to 500ppm, now it’s 15 ppm….ULSD. Diesel is far cleaner now, but it’s been a rough road….CAT failed with its ACERT engines and pulled out of the over the road truck engine market.
Let's get to the point of it all. Since ALL of 2008, we have had new diesel trucks running the new emissions motors & systems - VERY expensive, very undependable, terrible resale on the class-8 & medium duties, & shorter engine life. Also, with the ULS diesel, there is virtually no lubricity in the fuels anymore, so everybody is dumping additives into the tanks to make up for the loss in sulfur. I would bet there is NO measurable improvement in air quality. So what have we accomplished aside from "moving forward?" I'd say we've taken a few major steps backward.
