High mileage oil usually just has additives in it to make seals swell up to stop leaks or oil consumption.
A few years ago when there was no high mileage oil people didn't just stop driving their cars at 75,000.
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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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