Other factors can apply, extreme use like tracking the car would dictate a little more often. I'm thinking of an extra change right in the middle of the free servicings.
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2008 E92 M3 Jerez Black,DCT,Fox Red ext,Prem,Tech,19", ipod/usb, CF roof and trim
2010 E91 328i Space Gray,Black int, M sport, most options
2007 Montego Blue 335i (retired)
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