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Waldo Jim, Ray's close, actually capilliary action pulls the oil up the steel wool filler of the air cleaner, if yours is missing you can get replacement coarse steel wool at a hardware or warehouse store and use that. DO NOT get the steel wool with soap. It's recommended in the manual to use the same weight oil as you're using in the engine, I generally use 20 weight all year. The capillary action is strong enough to hold the oil up, but not strong enough to hold oil and dirt, plus the dirt helps break the surface tension of the oil which also helps the dirty oil fall back into the bottom of the filter, through the incoming vacuum. You can observe this if you are running your tractor all day in dusty conditions, start with a clean filter, run the tractor all day and check the filter, it'll have fresh dirt in the bottom of the cup. After the dirty oil falls into the cup the steel wool again picks up the oil only, leaving the dirt in the bottom, for another circuit around the filter. The main thing is keep the filter working and clean. If you go to look at a tractor with the idea of buying it and it doesn't have an air cleaner, consider as part of your purchase price will be an engine rebuild. Good luck. Mike
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