+ make sure the tensioner bearing is not going bad (not the pulley bearing, but the bolt that attaches the assembly to the front of the motor)

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2009 E320 Bluetec 117,000
1995 E300D 306,000 Sold
1996 Ford Taurus LX 130,000 Sold
1985 300TD Still 225,000 Sold
2016 Ford Fusion 24,900