I'm getting set to roll up on 1000 miles in my 330Ci and was thinking of changing all of my fluids. The oil and filter will definitely be changed, and was debating the value of changing the tranny (5spd manual) and the rear diff as well. (Mostly to clean out any dirt/metal/etc left from assembly and break in.) After all, fluids are cheap and easy to change, and I've always had really good luck doing this on other vehicles. Thoughts?