I'm trying to decide if I should change my serpentine belt. The problem is, I'm all about preventive maintenance, but also I don't like to fix things that aren't broken. My expy has 130k miles on the orginal serpentine belt, but it's 80% freeway cruizing and the belt still looks almost new. I've read they are supposed to be changed between 60 - 100k... do you guys think I should get a new one now or wait longer until I see signs of wear? I'm kinda of leaning towards getting it done now so I have an excuse to install these performance pulleys.