My understanding (not necessarily correct) of oil viscosity is that the first number is the actual viscosity of the oil at ambient temperatures. The second number is the viscosity at operating temperatures. So, to me, a 5W-20 oil is basically a 5 weight oil that doesn't thin out as much as a straight 5 weight oil would. I'm sure one of the oil experts here will correct me on this.
What I will say about this is that I would hesitate to use modern low viscosity oils in older engines. Most modern automotive engines are using more tightly controlled clearances along with some VERY sensitive mechanical devices - like hydraulic tensioners on timing chains and variable valve timing. As such, they have a whole new set of requirements for lubricants. An older tractor engine might have larger clearances and altogether different lubricant needs.
I would think that your safest option would be to use the straight 30 weight. Might crank a bit harder, but otherwise just a bit heavier oil.
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Today's Featured Article - Tractor Profile: Oliver 70 Row Crop - by Staff. The Oliver 70 was part of the "Fleetline Series" and was manufacturered from 1937 to 1948. The row-crop configuration could have either dual or single front wheels. The Oliver 70 was also offered in the standard, orchard and industrial configurations. The tractors were sold in Canada. An early advertisement states "Power when you want it - power when you need it - power to help put in crops when field conditions are right and time and help are limited. That's the power you'll find in an Oliv
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