Based on other posts (and BMW's listing of approved devices) BMW software does not yet support Generation 6 iPods. You may want to check with your dealer to confirm current support status. Apple tweaks their software with every new generation and issues periodic updates via iTunes for prior generation iPod devices. If you have a setup that works you may wish to decline those updates until it is confirmed they will work the BMW software.

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2008 4.8i Mineral Green Metallic Sports Package, Technology Package, Cold Weather Package, Rear Climate Package, Premium Package, Premium Sound with iPod adaptor & Sirius Radio, Auto Tailgate, Head up display