Single weight oils, say 10W has a certain viscositiy (in centistokes) when cold and is considerably thinner when hot.
40 is a lot thicker (flows slower) when cold, but also is considerably thinner when hot.
10W-40 has the viscosity of 10W when cold and 40 when hot, which means it changes less than either straight weight oil. I do have a book that gives those details, but if you google the oil maker's specifications for a particular oil you can find that data on line.
In summary, 10W-40 is thinner when hot, but not nearly as thin as 10W would be at the same temperture and is thicker when cold, but not nearly as thick as 40 would be cold.
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