I'm going by the GM Oil Life System.
I had the same thing on a BMW. Average oil change was around 15,000 miles.
I figure that the manufacturers, who have to fix problems for free, under warranty, know best.
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2008 Ford F250 Super Duty, 6.4L PSD, XLT, 4x4, LB.
2006 Hummer H2 SUT.
2003 Land Rover Discovery S.
2007 Mercedes Benz E350.
2006 BMW M3 Convertible.
2007 Harley Davidson FXD Dyna Super Glide.
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