Old engines in tractors have very light cam to lifter pressures because they run at 2000 or less. This is a sliding friction with steel on steel. Modern cars using the 5W 30 and 0W 15 oils all have roller camshafts and followers. The zinc found in 10-30 , and 15-40 oils is not in these new oils. Primarily as it is undesirable in catalytic converters. So two conclusions: the thin oils don't belong in old tractors, and old tractors really are not stressed enough to care much. Zinc does improve the sliding friction wear factor. Diesel grade 15-40 oil from Delo, Shell, or other quality source work well, providing good starting and 40 wt protection warmed up. jim
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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