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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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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