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Originally Posted by Diesel Guy
It's called "regeneration"...... Passive regeneration occurs normally while driving if exhaust temps are high enough.....active regeneration occurs when temps are low, and as the back pressure in the catalyst rises, the system begins to regenerate.....and this is what you might smell when you pull in the garage .......I haven't sensed any performance issues, and I don't know if BMW is able to control either turbo to raise temps during regen which might be the performance issues you've sensed....
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Thanks for the response. The manual in my '11 35d, actually calls it departicle process, but regeneration makes sense too! It mentions that during this brief process you might need to press the accelerator more, and notice a different feeling in the car while driving. Usually this "process" happened when I pull in the garage, but lately it's been happening when I am driving.
Funny, I imagined the majority of the "smell" would come from the exhaust pipes, but when this process happens while parked in the garage...the smell is strongest in the engine bay!