You can't use modern GL-4 or GL-5 hydraulic oil unless they are labeled yellow metal safe. The sulfur in some of them will eat away the bushins and stuff in your transmission because they are bronze. The original GL-1 is still available at Napa in 5 gallon buckets or at TSC in two gallon jugs. The oil at TSC is labeled Ford tractor mineral oil. When the Ferguson tractors were to be used in cold climates Ferguson recommended that a 10w30 engine oil be used. I have heard of some using the 15w40 diesel oil but remember that you hydraulic system does not have a filter. The pump was designed to let dirt fall into the sump, where it would remain until the pump was removed and cleaned out along with the housing. If you use a detergent motor oil it keeps the dirt in suspension and because you do not have a filter it will keep running the dirt thru the hydraulic pump and transmission. Lots of us are still running the GL-1 because it is safe for the transmission and hydraulic pump. Yes it is thick in cold temperatures, but I let my tractors warm up before using them, which is something that should be done anyway. I use GL-1 in both of my TO-20's.
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Today's Featured Article - Show Coverage: Central Illinois Strawberry Festival - by Cindy Ladage and Janna Seiz. Every year the coming of summer is highlighted by different events for different people. For some, it is heralded with the end of school, tilling the garden, or completion of the planting season. To us, connoisseurs of find food, antique tractors, farm toys, crafts, and downright fun, the annual Strawberry Festival means summer is here. Every year, in Carlinville, Illinois, the Macoupin County Historical Society and the Macoupin Agricultural Antique Association team up to fill th
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