WARNING: This page is about a different car, the 2010 BMW X3, 2009 BMW X3, 2008 BMW X3, and 2007 BMW X3. However, it is still accessible from the selected car via links, so may be relevant.
TECHNICAL DATA - OIL SUPPLY N52K B25
Oil change volume with oil filter
ltr.
6.5
Oil change volume with oil filter for auxiliary engine oil cooler