> wrote
> 2006 330xi
>
> Oil change every 4k mils, or once a year?
> I couldn't find a clear answer from owner's manual.

The manual is actually quite clear, as is the car. The car's
computer counts down - look at the message line in the
instrument panel - and tells you when. Once yearly or
about 15K miles.

Many people halve the 15K.

FloydR