The whole story is WD40 = Water Displacement, 40th formula (that's when they were satisfied with it and quit).
Like Richard I also use automotive grease on the hinge pin and other critical areas. I use the red synthetic grease. I like the color. Buy a big tube of it (automotive), put some in a baby food jar, and you have a lifetime supply of hinge lubricant for a few pennies. Use the rest on the car, lawnmower, or tractor.
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