Check disa flap for play and check/replace gasket.
Clean ICV.
Replace CCV tubes with cold climate ones - the insulation is thicker.
Replace dipstick o-ring.
I just did the CCV and replaced a starter on a 2003 2.5i Z4. I replaced the intake boot as well just because I was in there. Mine was 17 years old and I figured it had served its time. Just my 2 cents.