Oil Light

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Onstar is free for one-year (safe and sound package). If you sign up for the diagnostic email, they program your BCM in your H3 to send a complete diagnostic download on that same day, each month. If the vehicle is off, the BCM will send the next time it is started.
Onstar then emails you a message with miles, diagnostic information (if any) oil life usage, your phone number, number of minutes left, XM radio ID if you have an XM radio. They also relay your exact location to Homeland Security and NSA, so GW knows what you are doing.
It's free and a nice feature.