If you do a search in the Ferguson Forum, you"ll find some info on this. It comes from a Forum member in England where apparently they cannot get GL-1 type oils. This gentleman contacted Castrol for a recommendation and that recomendation was to use 15W30 motor oil. 15W30 motor oil is not common in the US and so people have used 15W40. Several posters have used this for several years and report better cold weather performance and no other problems. Note that these recommendations were made for a Harry Ferguson vintage tractors (TO-20, TE-& TEA-20 and TO-30, etc) not ones with wet clutches or wet brakes.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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