20yo 3GM30F, want to replace the Racor pre-filter. Currently has a brown 2 micron element, and this seems small to me. I know the Volvo Pentas call for 30 micron elements on the pre-filter. Been reading what I could find for manuals, not seeing a recommendation. Anyone have a recommendation, or know specifically what Yanmar recommends? Engine runs fine on the 2 micron, fwiw. Thanks.