20w50 will probably be ok. I know of some using 15w40 diesel oil with no problems. If you can find non detergent oil it would be better because the design of that pump with the original GL-1 which is non detergent, it will let particles of dirt in the oil settle to the sump and they remain there until the pump is removed and it is all cleaned out. If a high detergent oil is used it will keep the particles in suspension and they will keep being ran thru the hydraulic pump since there is no filter. So non detergent would be better, low detergent would be ok.
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Today's Featured Article - Tractor Profile: Allis-Chalmers Model G - by Staff. The first Allis-Chalmers Model G was produced in 1948 in Gasden, Alabama, and was designed for vegetable gardeners, small farms and landscape businesses. It is a small compact tractor that came with a complete line of implements especially tailored for its unique design. It featured a rear-mounted Continental N62 four-cylinder engine with a 2-3/8 x 3-1/2 inch bore and stroke. The rear-mounted engine provided traction for the rear wheels while at the same time gave the tractor operator a gre
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