Just had my 2003 A4 TDi 130 serviced by a local independant (other halfs dad in fact) and long life oil went in. When I reset the service indicator how does it know if bog standard oil or the long life stuff is in? Surely as the mileage can vary on long life as opposed to set interval with regular stuff how does it tell? Also the handbook was a little confusing, it states cambelt at 60K and 80K?!?! Mine had the belt done at 60k so I assume the next time it needs one is 120K ? Thanks for the help!