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For people with Warranties, I would be careful if you plan on running different oil. While it may prolong the life of your bearings, you have voided your warranty since the oil is not approved (or so that is my understanding). Therefore, if you are under warranty and your engine goes ca-put, hopefully BMW will not take an oil sample and determine that you were running the wrong oil and voild your warranty.
This is my understanding and please correct me if I am wrong (I have been wrong before!!)
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