[GreenD]

I've had a rhythmic squeak on cold start since about 20,000 miles, have 32,000 on it now, it goes away after a minute or so. I've inspected the belt and pulleys, see and hear nothing, have had the dealer look twice and found nothing. I haven't replaced the serp belt but probably will do so and see if it was just something with the belt. I'm not worried about it but obviously would prefer to find it and eliminate it.

JMO, I wouln't use belt dressing on a serpentine belt arrangement, it should never be needed.