Hi my a3 53 plate 168,000 miles had leak warning came on after 4 - 5 miles I topped it up few times but got tired So I bought the little blue bottle it worked instantly but after 12 weeks she's leaking again only worse bought second one but it didn't work this time round every light on the screen came on and the horn was on constantly bit embarrassing when at the local store I knew it was my car but every one in the shop were staring through the windows I kept mum !! got served and left but it got quite as I drove home I'm underneath it now searching temp never got into danger zone but I only use it round town any way.