Originally posted by: mercanucaribe
Originally posted by: drnickriviera
I've been waiting for a small diesel for a looooong time. Ford was rumored to be working on one when I was shopping for a truck in 01', but that never came to life. I ended up with a Ram 2500 diesel.
I was talking with my neighbor who has a toyo truck. He's only getting 22mpg with a I-4. I thought that was pathetic considering i'm getting 18+-.
The last issue of TDR had an article on the new ultra low sulfer diesels. Right now we are running 500ppm. The new standard will be 15ppm. It says Euro standard is 50ppm.
Looks like there may be some issues with fuel lubricity and seal compatability.
Why would their be issues? It's possible that the sulphur acts as a lubricant, but what would affect seals?
I dunno, maybe you can make better sense of the article than I can.
"First let's look closer at the aromatic content and seal compatability issue. By definition, aromatic content is characterized by the presence of the benzene family in the hydrocarbon compunds that occur naturally in the refining of diesel fuels. In the chemical makeup of fuel, the heavier aromatic compunds of toluene, xylene, and hapthalene also are present. Limiting these aromatic compunds has the effect of reducing burning temperature and thus NOx formation.
Unfortunately there is nothing an owner can do to prevent seal leakage. If the fuel injection pump or fuel transfer pump was built or remanfactured using a nitril-type rubber seal it is a likely candidate for leakage"
"It is not that the sulfur has any qualities that add to a fuel's lubricity, but rather, it is the hydrotreating process that removes the sulfer also removes some of the lubricatin properties in the fuel"
It goes on to talk about the fuel companies are supposed to add lubricants to the fuel.