>>2880751
There's no fixed border between lubricant and penetrant.
>penetrant
Needs to be thin enough to flow into pores (in other words, the spreading pressure needs to be greater than surface tension at the pore's diameter).
>lubricant
Needs to be thick enough that under pressure, the lubricating film is not interrupted. With cutting lubricants (where some of the lubricated material is removed) or engine lubricants (where the lubricant will drip back into the sump at standstill) it also needs to be thin enough to reach everywhere quickly. That means that th higher your rpm, the thinner a lubricant should be, while with increasing pressure, it needs to be thicker.

tl;dr: penetrants need to be as thin as possible, lubricants as thick as possible.

WD 40 would make for a good lubricant at extremely high rpm (think air grinder), but for lubricating doors, it's one of the worst oils you can use. Ballistol and other oil / soap / water mixtures are even worse, though.

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