Belts typically need to be replaced every 60,000 to 90,000 miles. 

But, contrary to what many technicians believe, belt tensioners, idlers, pulleys and alternator decoupler pulleys are wear parts too – and they all tend to wear at about the same rate. 

If your customer is replacing the serpentine belt but they neglect to replace the tensioner and pulleys, that could shorten the life of the belt you just sold them, as well as other front-end accessory components.

This video is sponsored by The Pronto Network.