Thanks
Helmsman - too nervous.
The
Tutorial for the spark-plugs here in the DIY section was indeed very helpful already.
I will have a specialist look at it on Saturday as well, will let you all know the outcome. An inspection would be due soon, so we gonna prepone the same, fix the leaking diff, change the DCT transmission oil. Might even be the spark-plug(s) only, not really sure, when they were last changed.