Penetrating oil, also known as penetrating fluid, is a low-viscosity oil. It can be used to free rusted mechanical parts (such as nuts and bolts) so that they can be removed, because it can penetrate into the narrow space between the threads of two parts.
Penetrating oil, also known as penetrating fluid, is a low-viscosity oil. It can be used to free rusted mechanical parts (such as nuts and bolts) so that they can be removed, because it can penetrate into the narrow space between the threads of two parts.
Source: Wikipedia "Penetrating oil" · CC BY-SA 4.0
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