My 650i 'Vert is just four weeks old & this is my first post here. I have a question about cost of ownership. At delivery the dealer offered a "maintenance program" that would cover routine maint. after the 50 k mile free coverage to 100k miles. They asked $2300. What has your experience been about out of pocket costs for maintenance issues? This is not the extended warranty (that was$4500) The dealer service advisor quoted ~$350 for spark plug change at 60k, Oil& Filter @ $130 (X3), cabin filter change $200. What else am I missing here?