Originally Posted by elm3
I change my oil every 7,500 miles. It is synthetic and it will not break down like conventional oils. But oil gets dirty and all you are doing is moving metal particles and dirt all on your bearings and such. As far as tranny and rear diff. I will be doing that when the car turns 30k. It is also good to flush your radiator once every two years. I will be doing mine this coming fall. BMW doesn't flush radiators, they call it lifetime fill.
Are you paying for tranny/rear diff? I just had my 30K, and the dealer didn't change these, although I've heard of other dealers changing out these fluids at 30K for their customers. My service rep told me that after break-in, these are lifetime fluids or 100K miles.