Heres my two cents orth on the subject of oil and filters.
I have a 1993 Bonneville with 305,000miles, A 1998 Bonneville SSEi with 142,000 miles, and a 1999 Park ave with 143,000 miles.
I have used the Fram EXtra Guard filter and the generic oil you get at Advaced Auto parts almost exclusively for all three of them and they all three are in great condition. In the past year I have replaced the valve cover gaskets in all of them and they are clean as a pin inside. I change the oil every three to five thousand miles. In my opinion changing the oil frequently is way more important than what kind of fancy or expensive oil and filters you buy.
That being said I did recently have a problem with low oil pressure. I had left the filter in my SSEI for approx 7000 miles ( changed the oil at 3500 but, not the filter ) I thought I had major engines problems. As it turned out, changing the filter solved the problem. I took the filer apart and looked at the filter fabric. It was dark in color but I really could not see anything wrong with it. It only stands to reason that if you leave a filter in too long it will eventually get clogged. I have since strayed away from using Fram filters more because of the article above than anything else.