Jim's opinion is controversial, but I think reasonable. (since it is mine). The 6 cylinder tractor has an issue with valve cokeing. This means that the oil coming down the valve stem gets heated to the point that it forms a carbon deposit of serious proportions that can and does cause valve failure, and poor performance from having a big glob of material in the port. This happens because the valve guides allow (opinion) too much oil to get past into the port. Modern valve seals (as found on today's engines) have solved that issue while providing measured amounts of oil. I believe that if the head was given valve seals when rebuilt (if it has been) will allow the use of any quality oil. If not I would use low ash oil in it. I would use 10-40 oil, or 15-40 Diesel grade oil (prefered) in the others. Jim
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