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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