Just after some info here. Last week my DIS flashed up COOLANT for a brief moment then went off. After my journey I checked the level and it was appx 1cm below the MIN mark on the tank. I went into Audi Macclesfield and spoke to the service manager about it to which he said it is normal for the car to lose some coolant over time, but if it was lots on a regular basis then there would be some cause for concern. Anyway, I bought some VAG G12 PLUS PLUS from them and filled the tank to just under the MAX mark with the coolant and some water. This is the bit which is worrying me but maybe for nothing: This morning after my journey into work I checked the coolant tank and its level was floating just above the MIN mark. I opened the tanks cap (engine had just been switched off) and it let out the hissing pressure noise, but then the coolant level shot back upto where I had filled it upto last week. Is this normal and right? I was just very worried before I opened the cap at seeing the level just above the MIN mark and thought to myself do I have a leak somewhere? But when opening the cap it shot back up. Should I have any cause for concern here?? I cant see any traces of coolant on the floor at home or anywhere in the engine bay, and ive got no running issues. It's a 2.0TDI 140 56 plate. Thanks.