Read the manual 80's engines run 10W-30 or 10W-40. You will hear a lot of advice about some "super oils" ... or the best oil. Buy what YOU like.
Just stick with conventional oil, I would go with a 10W30 in the winter and then switch to a 10W40 in the summer, keep an eye on the oil, sorry to say but the little rampages were known to use some oil when they got some mileage on them.
When I had mine I used 5/w30 synthetic motor didn't run hot at all quaker state oil
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