Wow great information. Looks like the S4s is old straight forward diesel. What does that mean. Well in short it's not a new high pressure diesel like in German cars. It has a governor and high compression. The pistons are of new design and are most of the reason for low fuel use. I can't see if there is EGR but it looks likes to me there is no EGR. I many ways this is good, no electronic's to fail and no major pollution stuff to worry about. What you didn't get. Much more power and economy. What did we get, an engine that will run along time, and I see know reason why bio-diesel would be a problem if you want to run that in some percentage. You will not have to run the very expensive oils for ESP diesels.
HS
