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More years back then I care to think about, I took a chemistry class and if my memory is right it's spelled polymers. A polymer, I think, is a compound that repeats itself. But thats as far as I can go with it. I guess a chemist would have to explain what it does to oil to make it multigrade. The Pennzoil site has a thing about it's ingredient Z-7, something about springs uncoiling and balls getting larger. In the great synthetic debate, else where on this board, someone mentioned oil under a microscope looks like balls. Gene, I would have automatically thought that 10w-40 would provide more protection than 10w-30, especially in a hot climate. But since you put it that way, that more polymer must be added, I can see that does not seem to be the case.

multigrade oil
Parts and Repair
Replies 13 Post by ERNIE B.