Well, the software has been updated.
Oil was changed again - after only 3300 km / 2060 miles
The oil is being sent in for analysis. I wonder how bad it was this time.
If the troubles seem to be gone, it'll be rechecked before the next maintenance to verify that the troubles are really over.
The forced particulate filter regeneration is not exactly a pretty experience.
It's an automated process, controlled by a black box.
Engine is warmed up, then revved to 4000 rpm with no load, and the regeneration process is started.
It took about 15 minutes at 4000 rpm.
The engine hardly ever gets pushed over 3000 rpm, let alone unloaded
I did some 100 more miles afterwards, and it felt rather smooth.
Decided to fill up again, but my MPG didn't seem to have taken a huge hit because of the forced regeneration - just 1 or 2 mpg.