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 - Talk of the Town: Winterizing Engines - To Drain or Not to Drain? - by Russ Berry. What is this strange attraction I have to equipment and machinery? How did I get this way? I came from the suburbs and own a small horse farm in rural Loudoun County, Virginia. You can call me a "weekend farmer." The local farmers do. Does it bother me? No. I am just happy to have their friendship. At least the word "farmer" is in my title. But what is the attraction? How can I explain the sensation and exhilaration I feel when I turn the key and hear the engine come to life (most
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