My 2010 Jetta TDI has just 6300 miles on it but being one year old, was due for it's first oil and filter change. I made an appointment at the dealership where I bought the car and had that done. I live quite a way from the shop so it was not until I had gone about sixty miles that I checked the oil level in the engine and was surprised to see that the dip stick indicated level in the "MUST add oil" range. Fortunately the engine did not lose oil pressure during that sixty miles. My owner's manual said capacity of the diesel engine with filter was 4.2 quarts or 4.0 liters and the dealer's invoice indicated four quarts had been used in the refill. But, about five months after I took delivery of the car I received by regular mail a single page Supplement to the owner's manual for USA 2.0L TDI engines in Jetta sedans which reads "The engine oil capacity of the engine has been modified to Approximately 4.5 quarts / 4.3 liters." So I called the dealer's service department and informed my Service Consultant of the problem. He seemed puzzled as his computer indicated the 4.2 quart capacity and asked that I e-mail him a copy of the Supplement which I did. We also speculated that perhaps all their 2010 TDI engine owner's having brought their cars in for the initial oil change drove out of the shop a half-quart shy of lube oil in their engines. I used to change my own oil but am beyond that at this point in my life.