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OK, I got the good oil as it were from Ryco engineers today at the Auto Expo..
They manufacture their filters based on OEM specs.. they have a thick 5mm base plate unlike some cheaper ones.. The filter medium is as good or exceeds that for Toyota and Subaru. Oil will flow through a spring valve when you first start up and the oil is cold. As it warms 100% goes through the filter as the rate is massive.
People who say they have a high flow rate filter are giving you a filter with bigger microns in the filter medium which mean in short that bigger particles that would normally be trapped can go for a second round.
The filter importantly has a rubber internal sealing ring which for the FA 20 motor with an inverted filter means that when you turn off only the oil in the core drains back into the sump.. the rubber ring retains oil in the body so that you prime quicker on start up. Makes sense
As for magnets on the outside.. a waste of time and a gimmick as the filter gets anything trapped before it gets to the outer wall as from there it is back to sump.
I hope I got all that right. For me I am not wasting any money on Toyota or Subaru marked filters.. as for the Jap branded HKS etc.. a bigger waste on colourful filters with magnet gimmicks.. That's just me.. you decide what works.
PS. I am not sponsored by RYCO ... I buy my filters from wherever I can get them.. this is not an add for those left wondering
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