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I'm planning on doing the same thing as Gatoman39 and changing the oil myself in between dealer services. Question for everyone is whether switching between the BMW oil (on dealer services) and Mobil 1 0W-30 (on my own service) would have any impact to the car. The Mobil oil is more convenient and cost less since they sell it at Wal-Mart. I was wondering if this switching back and forth would affect the car in any way.
Thanks.
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