I diagree, since ZSTO lasts a lot longer.
No clue why they call it three in one.

Christopher A. Young
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My parents used to have the stuff called "sewing machine oil". In my
opinion, it's the same thing as 3 in 1 oil, minus the odor.
Oil is oil, it just the thickness that matters.... both of these are a
very thin oil.

Why is it called "3 in 1" anyhow? Does anyone know?