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Originally Posted by alpac
I agree but one reason why a same diesel engine would be more polluting in the USA is due to the quality of the diesel which in the USA is less refined than in Europe. However, I believe new environmental rules have been recently put in place which require a dramatic reduction in the sulfur content. This should very soon be reflected in the diesel sold in the USA.
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A law just passed though mandating that they start selling the new low-sulfur diesel. By now 80% of stations are supposed to be selling it, eventually 100%. Even the Sunoco down the road from me sells it.