Bryce, that 80W-90 is what I would use, Same thing I used in the A & B John Deers that orignally called for 140 weight and back when I still had the Farmall H think we used the straight 90 as the 140 would not flow even in summer but Then when we had the 1941 H (1949 to 1984) multi weight was not avaible. The Deere books called for 140 untill 1947 when they went to calling for 90 weight. As they found out the heavier was not working as it should. The newer tractors that call for the lighter oil are machined to different spects. The same as you putting the 5-30 called for in some newer cars into a 1940's car they were machined loosed and you would not get oil preasure and you would burn out a bearing because of lack of lube. And I am now 73 and was raised with 1940's cars and tractors. Newest tractor was a 1968 model.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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