I agree mkirsch, any universial tractor fluid that "meets or exceeds" OEM specs will work in a +40 year old tractor as well as most modern equipment. My 504 has had generic fluid in it since 1962 or the first time the fluid was changed. If it doesen't "meet or exceed" OEM standards, then the company will be sued and loose their tail. The same refinery that makes Hy-Tran probably makes Delta Pride.
The purists that harp on Hy-Tran probably use Super Tech in their engines. I use Mobile 1 in all my automobile engines as well as synthetic transmission, differentials and transfer case oils. But when it comes to a 50 year old tractor, I feel that a generic tractor fluid is above what was available when it was engineered and manufactured. I do use branded 15W-40 in the engine, but I buy the brand on sale.
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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