I"ve never seen any hard data on this but if I was concerned about this question ,I"d pull the valve cover off and see if there was sludge on the valve train components. if there was then I"d think i ought to change the oil more often. If you don"t see any sludge then all is probably well with your oil change schedule. If you want to be certain, have your oil analyzed
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Today's Featured Article - Timing Your Magneto Ignition Tractor - by Chris Pratt. If you have done major engine work or restored your tractor, chances are you removed the magneto and spark plug wires and eventually reached the point where you had to put it all back together and make it run. On our first cosmetic restoration, not having a manual, we carefully marked the wires, taped the magneto in the position it came off, and were careful not to turn the engine over while we had these components off. We thought we could get by with this since the engine ran perfectly and would not need any internal work. After the cleanup and painting was done, we began reassembly and finally came to t
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