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Message: <blockquote data-quote="Maniac" data-source="post: 487150" data-attributes="member: 20491">Euro 2M is our current M'sian diesel grade, which allows up to 500ppm of sulphur content.  This is reduced from the previous grade which had up to 3000ppms of sulphur content, which is why our buses, lorries & trucks had so much black smoke spewing before - sulphur being a major contributor to soot production.  Sulphur also generates sulphur dioxide/trioxide which can turn into sulphuric acid.Euro 3 specs reduce sulphur down to 350ppm, Euro 4 down to 50ppm and current regulation in europe with Euro 5 brings it down to less than 10ppm sulphur content in the Ultra Low Sulphur Diesel (ULSD).  The new cleaner burning common rail N47D20 diesel engines in our 320d and 520d's are able to accept Euro2M quality, but with compromises made in the exhaust system where the particulate filter is taken out and the tailpipe being oriented downwards, to channel emmissions out of harm's way. The engine will still put soot out the back, as a direct result of higher sulphur content, and "cleaner burning" can only happen when fuel quality improves.  Don't believe we run the risk of burning our pistons with sulphuric acid given the current ppm.The real risk is if the 5% biodiesel blend is enforced, with no other diesel alternatives at the pump, where sludge/coking may become a concern.  So far, no major problems reported with the N47, though it's only been in country for 2years so far.  Personal experience thus far with my 320d on Euro 2M - no black smoke out the exhaust, and no choke inducing "aroma" when idling in my porch.  No discoloration at my bumpers around the exhaust too, and my car's white.There's talk we'll go to Euro 4 soon which will be cleaner burning for the diesel engines, but nothing's confirmed so all we oilburners can do is to hope for now.</blockquote>

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