[Tim H]

There is a lot of re-branding in the oil filter business. A handful of primary mfrs producing for big box stores, parts jobbers, quickie lubes etc ... Sometimes they are made to lesser standards and some times they are the same filter in terms of quality and materials. The trick is having insider info to be able to acquire great filters at bargain pricing. I worked in the auto parts industry for about 35 years. In Canada AcDelco filters have been made by different mfrs over the years. The Napa / Wix relationship has gone on for a very long time. There was a time when Fram was a better quality product but seems to have lowered their standards to get into bed with Canadian Tire, Walmart etc ... Luberfiner was always top notch. K&N top line is a much better filter than their price fighter series. Products like Champ, Purolator , Fram etc will never make their way onto anything our family owns. I can't recall who used to make the Royal Purple filters, however a few years ago ( 5 or so) they seemed to be a cheaper product getting marketing mileage out of the good reputation their oil has with many racers / consumers.
As stated in an earlier post that it isn't worth cutting corners on good oil or filters.
We have always owned, built and raced Chevys and the only problem we ever encountered was with a Fram oil filter about 25 years ago.A friend and fellow racer had a similar issue that same summer.