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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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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