Not to bash he dealer but...
I've replaced MANY timing belts on VW's gas and diesel engines. Some were over 200,000 miles and I have never seen a toothed pulley that even remotly needed replacing
But maybe some have. Yes I replace the tensioner, water pump when driven by the tb belt, and various ideler rollers.
I look for honest dealers
They are all expensive and most oly see a few CRD's but I believe a good mechanic given the oppertunity can do a good job on them.I can recommend Crown Chrysler/Jeep in Dublin, out skirts of Columbus, in Ohio.
I have an extended warranty. It calls for a $100 per visit. On the last visit they needed to order a ps rack. After 3 months it came in and I was liable for the $100 that was fine. It was discovred the caster and camber were off that was not caused by replacing the rack and it would be $89 plus tax additional. So I said go ahead.
They just called and it's finished and they are not going to charge the $100 deductuable just for the alignment. That's hard to beat. Under the basic warranty it was another situation but I feel dealers hands were tied by Chrysler when they were new
