Ordered and fitted as a belt replacement for my 2006 Mercedes R350. During installation, I noticed that it was a much lighter belt than the MB OE belt, but the width and length were the same, so I put it on, thinking Dayco had been around a long time and wouldn't make inferior products . . . This went on for about six hours before the outer rib began to separate from the rest of the belt, found its way to the radiator fan and made a loud mess.