Thread: What's the big problem with Fram filters?
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Old 03-30-2005, 11:51 AM
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I run Mobil 1 and with a fram filter I get a pronounced knock at startup. With a Toyota OEM filter not knock at startup. My understanding is the OEM filter has a stronger back backflow/stop valve (not sure if thats the right term). No other changes have been made and if I put the FRAM on it knocks at startup. And I don't think its unique to my truck.
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