Btw... for those of you DIY guys... here is a nice Hazet tool for removing the oil filter cartidge cap. Hazet #2169-6 cost me 18 euros from StahlGrube.
The outer filter dia is 97mm and the tool has a 3/8 drive AND a 24mm nut built into its form. This filter cap works for both the 128i (N52) and 135i cars(N54).
good luck