this post was submitted on 28 Apr 2026
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That is actually how those ones were named. WD stands for water displacer (or displacement), which is what WD40 does, not a lube but an oil that replaces any water where you spray (which can then act as a lube but it's not designed to remain there long term). WD40 was the 40th attempt at developing a water displacer and it worked, so they stopped there.
Oh, I assumed it was viscosity like motor oil numbers.
Well TIL…. cool!