I purchased a A4 Avant 2.5tdiSE 155BHP in dolphin grey with black leather at the beginning of March this year,The car is 02 plate with 112000 miles, full service history with one previous owner + demonstrator for the first 6 months of it's life. I wanted the 1.9tdi but was not prepared to travel hundreds of miles to view one. so found a 2.5tdi locally. I've only covered a couple of thousand miles since I've owned it but have noticed the following things. Unfortunately the car was on longlife service which I now know is not ideal. When I first got the car I had a few issues with it not starting first time from cold when the temp was in minus figures. It always started first time when warm, had a scan and showed faulty temp sensor so replaced the sensor and the starting may had improved slightly plus the warmer weather arrived. After reading on this forum I thought it may be due to having the cambelt replaced and throwing out the injection pump timing, had it checked at a local VAG specialist and was within spec. One thing I did notice that if I wait not only for the glow plug symbol light to go out but also the self check OK light to go out, the car would start first time 9 times out of 10. Once started never have any issues, never goes into limp mode but it does sound very noisy/tapperty on tick over, once revved above 2-3000 sounds fine, any ideas? Also I have been amazed/worried at the cost of parts for the 2.5tdi, up to the point I'm seriously worrying about things going wrong and wondering whether to get rid or not! So what I'm asking is should 2.5tdi v6 with 100k miles on the clock sound silky smooth on tick over, or am I being paranoid? Please bare in mind this is the first diesel I've owned, my previous car was a BMW E46 320ci which sounded fantastic and was ultra reliable. Thanks Jon p.s. Please don't mention the CAMS!