[RAT]

I have seen evidence that the Fram filters can self destruct on the inside. Another problem is the anti-drain back valve is glued in place. After testing the flow on a Fram filter, I was lead to believe the cold oil does not get filtered until the oil has warmed up, filter went into bypass. The input pressure was 40 psi and coming out of the filter, with cold oil was 37 PSI. As the oil warmed, the output pressure dropped into the low 30's, like it was getting filtered, no longer in bypass. This PSI was comparable to other filters in the test, but only after the oil heated up. I believe the oil temp was in the 40's before the test begun.
I don't like the idea of dirty oil pumping through my engine or a glued in place anti-drain back valve. Fram in the past, built their own filters. I hear they are built by another company now, and cheap at that.