E350 BlueTec 2015 15K miles. Bought car 3 months ago with 12500 miles from main Dealer. My journeys are usually 20-40 miles long between cold starts.I would presume that the Adblue tank was filled up as part of their checks, but who knows? Going to South of France in a few weeks, should I top up the Adblue , I don't want hassle on holiday. If I need to top up where do I buy the stuff. Is it all the same, should I go to Halfords, Euro car parts or do I have to get it from MB?