After hearing all the discussion I feel very lucky that my dealer gave me a card valid for lifetime oilchanges. I am allowed a maximum of 4 changes per year. When I went in for the first change the service department wanted to charge for the oil as Mobil 1 is not included but the sales manager overrode their decision and had my record changed to prevent this in the future.

As I don't drive in the winter I expect this card will be worth at least 200 dollers per year.