Genuine BMW part 11 41 1 716 410: Control valve. The number stamped on the part is 11411716410; BMW's catalog files it under the short number 1716410. You will find it on our Engine shelf, under Oil pump with strainer and drive.
It fits every E46 body style (320i, 323i, 325i, 328i and 330i, 1999–2006), with the M52, M54 or M56 engines — and the European-market versions.
BMW draws it on 4 diagrams, among them Lubrication system/Oil pump with drive (11_2165) and Lubrication system/Oil pump with drive (11_2868). It weighs about 18 g (under 0.1 lb).
We have not had one on the shelf yet. Request it and we will tell you when one comes off a car.