Just remember that oil change intervals are set to minimize warranty repairs, not life after the warranty expires.
This is why it is a well known adage to not buy a BMW out of warranty due to minimal fluid changes.
If you plan on keeping your BMW after warranty expires, change oil every 6000 miles. If not, just do the BMW provided changes.
BTW, also change the front/rear differentials and transaxle fluids at 25000 miles not 40000 if you are keeping car past warranty. This will reduce gear wear from built up metal wear particles.
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