In sept i changed the oil in my oil burner bad valve guide stem geo prism oil burning eating beater that just wont die.I had a 5 quart jug of Mobil 1 High Mileage 10w40 laying in the garage from a friend so I used it.Well,oil burniing has stopped dead in it,s tracks.No more cold start blue smoke in the morng.This stuff really works.
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