Hey there.
I have the standard 100kw age and have the same problem with the plugs. took it to my mechanic and he said that there is a crack in the head or gasket. all the plugs turn orange after just over a week. the only problem i seem to have is when i start her up in the morning, just need to give her a rev to get what seems to be some moisture out of the cylinders. this only happens when it has been left over night. ive had the car for about 4 months now and its been doing it since i got it. oh the joys of finding out how bad the guy before you treated the car!!!! if this sounds about the same as yours try some chemi weld. i used car go seal up stuff and it did nothing. Best of luck to you.