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I think amsoil HAS changed their filter/foam stuff...I've had three 'lifetime' air filters replaced in the last several years, they were over 5 years old. Seems the old foam tended to break down under high heat....the one on the Saab almost crumbled when I took it off my K&N filter (I used the...

I've run a similar test with an amsoil plate filter and stock volvo plate paper filter on a 1987 volvo 760 turbo using a Filterminder to measure pressure drop across the filter (ok, relative to ambient outside the box). The filterminder has a sprag loaded indicator that indicates maximum...