Same deal on my Corolla. I would get a knock (and had it for years) when I started the car. I was using Fram for a long time but never new this was why. Once I read some of the info, I switched to factory and or PureOne. I now have no knock at startup. The Fram filter has cardboard end caps (the part that holds the actual filter material together) as well as what maintains pressure against the seals. Wet oil soaked cardboard is not that strong. They also have a very cheap plastic bypass valve. Spend the 2.99 and cut ANY Fram open and you'll see what I mean. I did a couple just to see and now use Factory Filters or Pure One only. On the Corolla the filter is up high on the motor and mounted sideways. What was happening was the oil would drain out and the car would have to refill the filter first. Probably not AS big an issue on our 4.7L since it mounts more vertically but I'm still not using it.
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