The modern serpentine belt is made of EPDM, which is a synthetic rubber. There are two problems with belt dressing on these.

QUESTION: During the past few months I've noticed a chirping noise from the engine of my 1999 GMC Yukon. Also, if I start the engine with either the air conditioner or defroster on, a much louder ...

Despite doing so much, most of us forget the serpentine belt even exists — let alone that its tension matters. But it does. A lot. Too tight and it'll grind bearings to dust. Too loose and you're ...

Belt dressings? Yes or no? I heard on your radio show this week not to spray belt dressings on serpentine belts. I recently was told to use belt dressings on my serpentine belt by a mechanic. He said ...