No, don't think that last comment is correct. Check websites for Donaldson and their dry pleated paper filters catch 99+% of the dust, some 99.9+%.
Then look for oil bath AIT filters. Nelson, Donaldson make them. And try to find a percentage of dust they collect. They do not publish that information. Back in the 1960's IH published a tractor tune-up booklet describing what and when tractors should be serviced. That was when all tractors still had oil bath air filters. They, IH said 80-90% efficient at collecting dust.
The dry pleated paper air filter is why today's tractors can go 10,000-15,000 hours between overhauls, and the oil bath air filter is/was why tractors 50 years ago needed rebuilt after 2000-4000 hours. Granted better engine oils and oil filtration help too.
I've run oil analysis on my PSD in my pickup many times, couple when I still had a K&N filter on it. Silicon, dirt, plain old dust was 2-3 PPM, and with the pleated paper element it has always been 0 or 1 ppm. K&N filter is much better than an oil bath, but not near as good as dry pleated paper.
I can't think of a single new machine that comes with an oil bath air cleaner today.
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