I'm new to this forum I have a 2006 TDI Jetta and like one month ago, i start to fill my coolant tank, about 1 liter every 130 km. My oil is good, no sign of white moisture in my oil filler cap, car don't have any white smoke. When i open up the collant tank, i can see some little bubble exiting the tank so i think it's an head gasket but after talking to some VW gurus here, they told me that they never saw any head gasket failure before on this model of engine so i would like to have more ideas please Don't want to remove the head for nothing !!!