303 is a John Deere spec trans hydraulic oil from the 60s . You can still buy 303 oil here . The bucket now has a warning on it not to use in machines built after 1975 .Basically 303 is a 50 year old spec oil . For your application any universal tractor hydraulic fluid will work should be able to find it at the same store you get the 303
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Today's Featured Article - Product Review: Lead Substitutes - by Mike Schordine. Lead was oriinally added to gasoline as an upper cylinder lubricant. It lubes the valves and seats. If you rebuild the motor, you could use hardened seats and valves, and unleaded fuel. But if your old tractor runs good, a simple lead substitute added to the gas is a perfectly reasonable solution. And, if you are like me, your tractor is under cover, but it sits outside. So with every temperature change, the humidity in the air collects in the fuel tank, in the form of water.
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