Funny i usually run it by the dealer over the phone and they say bring it in and we will drop a quart or two in. But when the message came up yesterday ( happens around every 10-15k for me) I just bought some mobile synthetic at autozone lol Did not feel like waiting around for the dealer. BMW claims in the manual that they recommend castrol haha But using 1 quart or two of 5w30 to 5w20 is acceptable on occasion haha

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2011 50i BS/Black Nevada
(gone) 2007 4.8i AW/Tobacco