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.. I've thought about using a System1. Is 30 micron filtering fine enough?
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I believe engine oil requires 50-60 micron beta mesh screen. While this sounds large, it's been demonstrated that particles of this size don't cause the damage.
Most paper element filters with impressive micron ratings bypass oil on start-up (and high rpm), often washing though stuff that was marginally trapped on the paper. The System 1 "safety valve" virtually never opens.