I have a 170ps Diesel S LIne Quattro (56 Plate) and reckon that it sounds quite tractor like lately? Am i going mad? Will/Can Audi sort this? Also tyres are coming up for replacing - do i need to change all 4 with it being a quattro - I am changing to a different brand so in that case do i need to change all 4 anyway?
Lots of questions - grateful for any help.