Using non VW oil filter?

The "Free" work is one of the things the VW dealer service manager used to rip me off with. The last time I brought my car in to VW was for a failed, recall replaced brake light switch. I had originally brought the car in for not being able to put the car into drive from park sometimes. They said it was a sticky shift button. The next week the check engine light came on with the same problem. When I brought it back it was 3 days past the recall part's warranty. I explained that I had brought it in for the same thing minus the check engine light a week earlier. The service writer said that they have to go by when the problem is diagnosed but that the service manager would probably give me a "goodwill" repair. The manager called me and said he would not do the goodwill repair because I only do the free work at the dealer! He then said that they recommened the tire rotation and I declined. I declined the recommened brake pad replacement and hadn't done the 40,000 mile services yet! My milage was 39,998! I had had that work ( tire rotation and brakes) done at an independant mechanic for a huge amount less. I was charged $100 to diagnose the check engine light! When I reported this the VWA they said that the dealers are independant owners and it is up to their discretion! I called, wrote, emailed and yelled with no results. That is the last time my car darkened their garage! But I will be there for ECM's and TCM's because they have to do it and they're free!