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SO, what do you all think?

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I was watching a seminar about oil filters by a retired Chrysler design engineer on the Modern Performance web site the other day, and was wondering what you all thought. He's said that the pop off valve in most filter open at around 10 lbs. pressure, and as a result around 20/ 25 percent of the oil doesn't get filtered, so, he recommends a filter like a STP that doesn't have a pop off valve. SO, what do you all think?

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Did he state how he came to this conclusion. Did he measure it?

The by-pass pressure is the pressure across the filter element, not the oil pressure. You would need to measure the oil pressure going into the filter and the pressure coming out of the filter to determine if the pressure differential is great enough to open the bypass valve.

The purpose is to keep the filter from becoming to plugged and restriction the oil flow to the motor, and/or causing the filter to fail.

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I was watching a seminar about oil filters by a retired Chrysler design engineer on the Modern Performance web site the other day, and was wondering what you all thought. He's said that the pop off valve in most filter open at around 10 lbs. pressure, and as a result around 20/ 25 percent of the oil doesn't get filtered, so, he recommends a filter like a STP that doesn't have a pop off valve. SO, what do you all think?

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I've used about every brand and type oil filter out there for stock BB and SB Mopars. None of the screw on type stock replacemnt oil filters I've cut open, including STP, didn't have the bypass valve and spring in the bottom of the filters, none of them The Wix and Fram race filters bypass at a lower pressure If you don't want to use a oil filter with a internal bypass use one for a GM motor like BB and SB Chevys use I don't and wouldn't