Modern oils have a limited capacity to neutralize the acids.
If water from combustion or precipitation does get into the crankcase it will settle below the oil if it separates out.
I think a tractor should be cranked and run every 3-4 months to keep the cams, rockers and pushrods lubed. This will also minimize rust formation. The engine need to be run about 10 minutes so that the cylinder wall temperature gets about 180 degrees F. This is so the acids go out the exhaust rather then precipitate on the cylinder walls. So I don't think oil has to be changed every three or six months if this is done unless someone is driving the equivalent of 3500 miles during that period.
Some of this information was derived from Julius Mackerle's book Air-cooled Motor Engines published in 1961 and translated to english
This post was edited by Deutz Lover at 18:07:44 09/05/15.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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