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Good morning, I am writing to you about a problem with the turbine, I have a smart 450 diesel CDI with 240,000 km from 2000. Since I bought it used (with 170,000 km) the turbine has always whistled a bit and has always been dirty, probably due to blow-by. A month ago, within a few days, the classic whistling of the turbine began to stop being heard, the smoke increased when accelerating and the car lost a lot of power (especially when going uphill). So I did the following: - coreassy replacement, with complete cleaning of the turbine and compressor scrolls (the new turbine runs very well by hand) - drained the oil before reconnecting the delivery (see photo) - oiled the turbine before mounting it - deep cleaning of the turbine oil delivery and drain pipes - check that the oil drain was not clogged (I let the oil drip with a funnel) - oil and oil filter replacement (synthetic 5W-40 oil) - disassembly of the camshaft cover and cleaning of the blow-by breather cover (it was not clogged, just dirty) - once mounted, I checked that oil was coming out of the turbine (photo with cold engine at 2 degrees celsius and idling) - visually checked the hoses and intercooler (didn't see any cracks or crevices) - reconnected the wastegete piston with preload (this turbine does not have variable geometry) Also I noticed that the old turbine had no play and the shaft turned really well so maybe it just didn't go? Now to make some tests I left the blow-by pipe disconnected and closed the hole upstream of the turbine. I have done about 300 km and I have noticed: - black oil actually comes out of the blow-by pipe, which I think was the one that dirty the whole turbine. It seems to me that there is also some water vapor, but the car does not consume water. - the car no longer produces black smoke when accelerating The problem remains that I don't hear the whistle of the turbine and the car doesn't have the power it had before (it goes a little more, but not much). I add that I have never seen any motor light on the dash, neither before nor after the coreassy replacement. Does anyone have any idea what I can check? Thanks a lot to everyone! PHOTO OLD TURBINE OIL BLEEDING PHOTO TEST NEW TURBINE OIL DISCHARGE