I have a 2011 T5 Multivan and I've been having issues with light grey/blue smoke coming from the exhaust. To try and fix the issue I have recently had the turbos replaced and that has fixed the issue slightly but there is still some smoke coming from the exhaust. The smoke doesn't blow all the time. When the engine is cold it doesn't blow smoke, when I am travelling at 100km an hour it doesn't blow smoke, and then every now and then for no reason it'll stop blowing smoke but will always start up again. It is particularly bad when I am accelerating but not so bad when I am travelling at speed. One of the more confusing things is when I only have under 15kms of diesel left in the tank then the van stops blowing smoke altogether, until I fill up. I have been told that the issue could be the turbo (but I have replaced this) or it could be the fuel injectors or it could be a number of other things. Would love to have some advice on this.