Having just replaced the cam belt on my 2.5 V6 (and a whole host of other things in the engine bay), I've just been looking at the auxiliary belt which came off and is 2030mm and is questionable whether that is stretched, or just the right size.
The listings for a 2.5 V6 show so many options - It appears the options are for a 2260mm belt (far too long and I can't imagine it fits any of the V6 engines), 2020mm, and there's even a 2030mm belt available, so my question is...... do I get another 2030mm belt, but if that stretches it will obviously not be a good option.
Past experiences have shown some aux belts are too tight and can cause problems. Incorrect alignment of the alternator pulley has been mentioned before which would make a 2020mm belt too tight - some even mentioning it's too tight to fit easily. I've had a good working alternator prior to fitting a tight belt, and that just resulted in it screaming after a period of time - in the end the car (Vectra 2.5) got sold with the scream.
Maybe I'm just over thinking this. Maybe I should just put the 5 year old belt back on, as I know it fits well. Maybe belts don't stretch that much? What do others think?