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Originally Posted by rgreed
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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It's not unique to your truck. My dad used FRAM or whatever cheap filter he could find, and his truck knocked at start up something fierce. I finally talked him into using the OEM or Purolator Pure 1 filter. No knock.
I've never used anything but Purolator Pure 1 on my Tundra. I don't know what would happen if I tried a FRAM, and I don't intend to find out.