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 - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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