http://theoildrop.server101.com/cgi/...=6;t=000513;p=
http://www.oilfilterstudy.com/index.htm
In the second study, the Premium plus flowed 17.2 oz per minute and the Pure One flowed 5.3 oz per minute.
Now you tell me that a car designed with a 17.2 opm flow and a higher BPV spring rate in mind will be fine with a filter allowing 5.3 opm flow and a lower BPV setting?
Those flow rates are not for our filter size, but the ratio should remain consistent between sizes.
I would trust Subarus spec on this one.