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Surfing on You Tube the other night I ran across videos on oil filters. Of course I viewed the rants on Fram filters. And then there are the men who cut open filters to see what’s inside. The funny thing is some of these people don’t know what they are looking at once the filter is open, calling the various parts by various names.
I use Purolator and was pleased to see it has a decent looking bypass valve in the bottom of the filter (in bottom I mean the end opposite the threaded end). Then I came across a gentleman who cut open three filters. He pointed out that with the bypass in the bottom, if the bypass opens, then all the deposits on the outside of the filter media are flushed to the engine. I didn’t like hearing that. A few filters have the bypass at the threaded end.
Then I started noticing, as I went from video to video, the same brand of filter would be constructed differently. Maybe this has to do with application but I doubt it. Then I viewed a video made by a Japanese man who was again cutting open filters. He had three of one brand and all three had the exact same part number (and box) and each filter was completely different from the other two.
So I am beginning to think that if I want to know what the filter is like I am putting on my car I need to buy two and cut one open. Any comments?
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