Sorry but the 220d is a problem car. The evidence is there for all to see. I'm glad you have a good 1 colbecoz :)
Doesn't change the fact that the head gasket in your car is a weak part! No amount of maintenance or good car keeping changes that. It's been good up to know but let me ask you this, would you be happy knowing that your head gasket was not covered by a free repair from Lexus?
My brother in laws 220d is coming up to the age limit where Lexus will fix it for free. He's had nothing but trouble with it, dashboard cracks, vibrating rear view mirror, poor mpg return, EGR problems etc... The only thing that hasn't gone wrong is the head gasket unbelievably. Guess what, he's selling it before he's out of the extended warranty! :(