Some people have wondered if WD-40 is a penetrating oil. The answer to that is a bit more complicated than you might think. WD-40 isn't just the name of a product, it's also the name of the brand ...

However, if the nut and bolt are very old and oxidation has taken its toll, WD-40 may not be able to get deep enough to loosen them. Penetrating oil — also known simply as penetrant — is ...

If it doesn't move and it should, you need WD-40." But is WD-40 really toolbox penicillin? Or is it the snake oil of lubricants? To find out, we culled various products recommended for use in five ...