This is the German Castrol oil I use in my 135i.
German Castrol EDGE FORMULA RS 0W-40 it is rated
"BMW LL-4".
This is the cheapest place in Germany to buy it from. Thanks to another 1addicts member who told me about this place/e-shop.
http://www.ebay.de/itm/ws/eBayISAPI....=STRK:MEWNX:IT
here is there "other" website...
http://www.oeldepot24.de/catalog/pro...products_id=78
I also found this website. They sell ALL the special BMW oils. Their prices aren't bad either. One interesting thing is this website says that BMW LL-4 is backwards compatiable with LL-1, but LL-1 can not be used where BMW LL-4 is called for!
http://www.oelwelt24.de/catalog/Moto...+Longlife+Oele
Dackel