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 - The Nuts and Bolts of Fasteners - Part 2 - by Curtis Von Fange. In our previous article we discussed capscrews, bolts, and nuts along with their relative hardness and thread sizes. In this segment we will finish up on our fasteners and then work with ways to keep them from loosening up in the field. Capscrews, bolts and nuts are not the only means of holding two parts together. When dealing with thinner metals like sheet tin, a long bolt and
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