Don't shoot me, I'm new to diesels (I don't even take possession of my car until Thursday!), but it looks like the discussion is going back-and-forth replete with opinion and a paucity of evidence. It is an interesting problem and I think an important one so I did a Google search to see what other folks think.

I can't speak to the veracity of these links but I think they offer additional insight.

http://www.allbusiness.com/manufacturing/machinery-manufacturing/401946-1.html

http://theepicenter.com/tow021799.html



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