Whatever oil you use it is important to use a low ash oil in those engines to extent exhaust valve life. Diesel oils generally have a high ash content because the ash is used to neutralize the acids formed in the crankcase by the sulfur residue from the fuel. On the 656 gasoline engine the high ash oils will leave carbon residue on the valve stems that will cause them so stick open when the tractor is put under load. When that happens it will burn out the valve just like using a cutting torch on it.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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