6,000 isn't really that long. I know there's a guy in the northeast who will warranty the engines he rebuilds as long as it's done with 25,000 mile oil changes.
Also, try this study here.
http://neptune.spacebears.com/cars/stories/mobil1.html
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Cliff Scott
2004 Alero GX w/sport pkg - Sold, living somewhere in WI now.
2011 Saab 9-5 Turbo4 M6
2004 Corvette Convertible M6
1994 Chevy Beretta - Quad4/M5
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