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Canby: You have quite a range in years there, and if you followed the maual for each, you would probably need a new shed just to organize the oils. I had much the same problem in the mid 1970s, farming with 7 tractors, 2 skid loaders, 4 trucks and a Combine. I had more oils around than I care to mention. Employees and yes, even myself were getting them mixed. 4 of the tractors were diesel, skid loaders were gas, trucks were gas and combine was diesel. One day I narrowed it down to 4 oils, top of the line in all cases. A diesel crankcase oil that went in everything including my car and 4 cycle lawn mower, a hydraulic-transmission oil for all tractors with TA or took oil from transmission for hydraulics plus skid loaders and combine, gear oil for all other tractor transmissions, final drives, steering boxes plus truck trans missions and rear ends and finally a power steering-automatic trans oil for trucks and car. Oil related problems dropped substancially, I never did a engine rebuild on a diesel under 10,000 hours, gas 4,000 hours, always got 250,000 miles out of a GM V8, 600,000 miles on a 6.2 Chevy in 80s and 90s. The lawn mower is a 1975 and is still going, now it is relegated to mowing just the corners past couple of years. Now my hydraulic transmission oil of choice at that time became John Deere Torque Guard as I had a Deere with power shift. 4 Farmall with TA got the Torque Guard as well. They were all using the same implement cylinders so oil was going to become blended anyhow. There is no question in my mind, it is, or was a better oil than Hy tran. In the mid 70s one could change a tractor to Torque Guard and watch the hydraulic rams glisten. Particularly noticable on a loader. I don't know how they compare today, but there sure was a difference 30 years ago.
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