I would use 10 40 oil of good brand name, 15 40 diesel grade is also just fine. Single wt oil was recommended when the tractor was new because that was what was the best at the time. It is not the best any more. In cold operation, the oil remains thin enough to allow easy cranking, about the viscosity of the lower number, and as it warms the oil just doesn't thin as much as a thinner oil would. It stays at about the viscosity of the higher number. Synthetic viscosity modifiers are used to make mineral (petroleum) oil do that. In pure synthetic oils, (also good if 20 wt) there is no need for additives, and the oil can survive higher temperatures W/O breaking down. Plug gap (if running OK is fine as is. The wider the gap the more voltage is necessary to fire the plug. A few thousandths will not matter at all. Fuels have fewer deposit forming materials in them today, allowing much better plug life and performance. JimN
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Today's Featured Article - Tractor Profile: Earthmaster - by Staff. This tractor, manufactured by the Earthmaster Farm Equipment company in Burbank, California was made for only two years. The Model C came out in 1948 and was followed by the "CN" (narrow-width model), "CNH (narrow-width high-crop model), "CH" (high-crop), "D" and the "DH" (high-crop) in 1949. The main difference between the models was tire size, tractor width and cultivating height. The "D" series were about 20 inches wider overall than the
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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