At 6k miles, MIL came on. After a series of stops to garage over 2 mths, and 10K service...authorized garage says u got bad diesel, need new fuel system, and vw will not cover the work. surely the fuel filters can deal with some dirty diesel and/or water? I'm awaiting all the paperwork from them to try and sort this out. Is this something I have to worry about forever now--"bad diesel"?