There seems to be lots of threads regarding 'sludge' & the 1.8t engine. After reading many posts regarding this problem I went and spoke to my local audi specialist to see if i should change oil pump + oil feed pipe, as a preventative measure. Speaking to the mechanic he said i shouldnt need to change these bits as the oil feed has a syphon/filter on which prevents the sludge (if there is any) from causing problems!?! He said the only reason i should investigate further or change these bits would be if my oil pressure light was coming on when im on the motorway, as when the car is cruising at around 4k rpm large volumes of oil are getting sucked through & at only this time would i be aware there is a problem! I am now really confused about how to tell if my car has this sludge visually & if i should change these parts regardless. (it was on AVS before i changed it to fixed). & if these parts should be changed how much its likely to cost.