My 2008 2.5L Jetta(in the US) has a coolant leak as I filled the tank to max line a couple of times but it slowly(over hours) went down to the same level in the picture. I don't see any leak on the ground below the car and the engine oil seemed normal.
Volkswagen engine bays aren't the most visible but I still tried seeing around with a flashlight, but didn't get anywhere.
What else can I check?