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 They do not publish that information.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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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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