303 was a john deere spec using sperm whale oil for better service over the 20wt oil use in type a hydraulic oil.. It was designed for wet clutches and wet brakes for tractors in the 60's and early 70s.... Todays copy of 303 oil has NO sperm whale oil as it was banned by international treaty... iirc in 1974. Due to the fact the oil has NO sperm whale oil in it, its false advertising to sell it as 303 oil. They can simply relabel it as a substitute for 303 but not as 303 due to consumer trade laws. Some of the manufacturers have already relabeled the oil for those states and have returned to it market. Newer auto/power shift tractors run more pressure, much more heat and require a simi synthetic blend oil. If you have one of these newer tractors you NEED to run the better oil.
If you have an older tractor with wet brakes and wet clutches, the 303 equivalent will work fine.
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Today's Featured Article - Harvestin Hay: The Early Years (Part 2) - by Pat Browning. The summer of 1950 was the start of a new era in farming for our family. I was thirteen, and Kathy (my oldest sister) was seven. At this age, I believed tractor farming was the only way, hot stuff -- and given a chance I probably would have used the tractor, Dad's first, a 1936 Model "A" John Deere, to go bring in the cows! And I think Dad was ready for some automation too. And so it was that we acquired a good, used J. I. Case, wire tie hay baler. In addition to a person to drive th
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