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 - Upgrading an Oliver Super 55 Electrical System - by Dennis Hawkins. My old Oliver Super 55 has been just sitting and rusting for several years now. I really hate to see a good tractor being treated that way, but not being able to start it without a 30 minute point filing ritual every time contributed to its demise. If it would just start when I turn the key, then I would use it more often. In addition to a bad case of old age, most of the tractor's original electrical system was simply too unreliable to keep. The main focus of this page is to show how I upgr
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