On the other hand, I have used FRAM in all of my vehicles - 69 Ford Truck / Mazda / Acura / - and my ranger, except for the last oil change - I switched to Mobile 1 synthetic blend and mobile 1 filter.....and had no problems at all. It has never failed on me, and have never heard any funky noises in my engine. it think it depends on luck and your driving style (high rmps and such).
I can definitly tell a difference between mobile 1 and fram and Pennzoil. I think its already worth it, so i won't go back