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Originally Posted by Curious Joel
Europe has new, much stricter requirements coming out in 2007 or 2008 for diesels.. I think they have to cut the particulate emissions from like 400ppm to 15ppm, like on the new MBZ E320 Bluetec. Seeing as BMW is a European company, I'm sure it will have the new "clean" diesels.
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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.