Still haven't had the time to change it yet - but yesterday I spent quite some time in stop'n'go traffic. The temperature came above 80 - and then it started the high temp regen. (600-650) I had to keep driving for it to finish, while it generated temps rose to 92. Pressure before the DPF was @ 22mbar before and ~14mbar after.
..Next step - to replace the thermostat tomorrow along airfilter and cabin filter. It got a new oil filter and new oil today