Also auf der Beifahrerseite?
Dann hier mal weiterlesen und die Anleitung runterladen.
Chances are, the o-ring on the chain tensioner is worn, allowing oil to leak out. This is another common problem on the V12 engines. The procedure shows you how to access the tensioner assembly for removal and repair.
Contributed by: Mark Fling (MarkinSBA)
To learn more, download the att121.pdf file below.
http://www.e31faq.com/Default.aspx?catId=88