The most likely cause for you problem is hardening of the O-ring seal between the center section and the rear frame.
The oil passage between the filter and the MCV pump goes above the normal oil level where the two housings join together. With age the O-ring will harden and take a set so that it will not seal properly. Air enters the suction side of the pump and as the pump starts to get worn it no longer is as efficient at pumping air as a new one. Adding enough oil to ensure that this O-ring is below the oil level will keep air from entering the suction side of the pump and the symptoms will disappear.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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