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Originally Posted by EngineerBoo
I used Fram oil filters on my 89 Z-24 and changed the oil faithfully every 3,000 miles. (But not synthetic.)
Results? The engine siezed up at 102,000 and needed rebuilding. Sure, it could've been due to the GM engine (V-6) but I'll not buy a Fram ANYTHING to this day. (And I switched all my vehicles to full synthetic.)
There was a website some years back where a couple engineers bought every brand of oil filter they could get their hands on and tested them and even cut them up to see how good the filters were on the inside. Fram was one of the worse they tested. (I remember the Purolators scored neared the top.)
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Here is the test that I had seen. Positives are that it at least gives you some insght to filter construction. Negative is that it does not test actual filtering ability. "Logical" assumptions are that the larger filter with more surface area will filter better. This is not true, it gives you more filter area but the actual media and bypass valve would determine what it will filter i.e. actual particle size. Think a piece of regular swiss cheese vs. baby swiss. The only way to really test that would be to set them up with the same exact oil with same dirt level with some back pressure and flow meters then also oil analysis to the micron level of dirt left. Too much for me. I cut some open and I'll stick with the 2 I mentioned. The Amsoil and Mobil 1 are probably excellent but cost and availability of factory and Pure One make them best for me.