i dont know the microns for an oil bath, but they always had a good reputation for doing a good job if in clean and correct operating condition. the main problem with them is that they require someone to actually maintain them and clean them occasionally. when they are old and full of dirt and maybe the oil is mostly gone, then they dont work worth squat, so a paper element is simple and is a "dumbed down" way to do the job. and it is simple and easy to change.

but if you jury rig something and it falls apart and you intake dirty air, you can do a lot of damage pretty quickly so be careful with that too.

the oil baths are a little more effort to use but do a good job if you are willing to stick with them and keep them clean.

should be cheaper too.

oh and once you get it clean there is a line scribed inside to fill to.

tom w

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.