The main thing I have read as far as using engine oil, is that it is better to use a non detergent oil because of the lack of a filter on the hydraulic pump. A non detergent would let any dirt or particles settle to the bottom where it will lay until the pump gets removed and cleaned. A detergent oil will keep the particles in suspension and keep running them thru the pump and these old tractors are full of particles. The only other thing I could think of is that some engine oils have higher levels of sulfur than others depending on the refinement and the additive package. If you were to use oil that had higher levels of sulfur then you might as well have bought modern non yellow metal safe hydraulic oil. It is the sulfur in it that eats away at the yellow metal, so if the engine oil has it also it could do the same thing. Personally I use GL1 in mine, but that is because at the time I couldn't find a 5 gallon bucket of 10w30 non detergent.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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