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a leaded engine requires you use gasoline with a lead additive which helps stop knocks and pings but is very hard on the environment, but on the plus side the leaded fuel would actually lubricate your valves and other fuel system components like the floats in the carburetter a non leaded uses fuel with different types of additives which believe it or not still contains a small amount of lead

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Q: What is the difference between a leaded and unleaded petrol engine?
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How do you tell difference between leaded and unleaded petrol in a can?

I don't think there is a way to visually tell the difference between leaded and unleaded fuel. However, leaded gasoline has become "extinct" and it is more likely that you have unleaded gasoline in the can.

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