Really informative thread OP. I'm picking up a pre lci 335D with 35k and did wonder about these issues but i'm happy to stick to v power diesel. But what additives do you use and how often? In my 320D it says no additives...
Also, i also have a DTUK CRD-T which i used on my 320D and im thinking of putting on the 335D. What maps and levels do you normally use?