I bought my Ex, and it had a Fram on it. The dealer said the oil had been changed the month prior, and had the service ticket to prove it had in fact been changed, and the Fram filter installed also, and it looked good. After a month of driving, my oil was pretty dark. Thought this can't be good, but everything was fine. Plugs looked great, no soot in the pipe, compression and oil pressure fine. So decided on an early oil change with good ol' GTX 10-30, and a K&N Gold (What I always used on my Mustangs). I held on to the Fram to inspect later suspecting it was bypassing. When I opened it up i was shocked. The pleat seal was not holding anything. The material was wide open letting EVERYTHING through the engine.
Fortunately I did the early change and had not done any hard driving, but here we are on my second oil change with the K&N, and the oil looks as good as the day I poured it in.
I do still use their air filters as they seem to be pretty decent, but I inspect them like hell before they go in and they do trap a great deal.
I've used K&N air filters for years as well, but I've begun to steer away from them after some recent reports and personal observations, but I'd recommend their oil filters above all others. they are more expensive, but compared to premature internal wear, it's a drop in the bucket, and as far as I'm concerned cheap insurance compared to the alternative.
After all these years of obvious manufacturing deficiencies, I find it hard to figure how they can continue to produce potentially harmful products.
For you and me who change our own oil it's a no brainer, but think about the countless numbers who rely on shops to do so and many use Fram.