Lubricating oil is used to avoid the damage of spare parts & smooth functioning of the machinaries.
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For lubricating your garage door opener, it is recommended to use a lithium-based grease.
lubricating jelly
The recommended type of grease to use for lubricating a bottom bracket is a high-quality bicycle-specific grease.
You can use a silicone-based lubricant or a light machine oil as an alternative to WD40 for lubricating squeaky hinges.
The sump is a tank (reservoir) at the bottom of the engine which contains lubricating oil. When the engine is switched off, the warm lubricating oil at the top of the engine, seeps back into the sump by gravity, ready for future lubricating use when the engine is running again.
The best type of grease to use for lubricating a hammer drill is lithium grease. It is a versatile and long-lasting lubricant that can withstand high temperatures and heavy-duty use.
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For lubricating a rotary hammer, it is recommended to use a high-quality lithium grease that is specifically designed for power tools.
Lubricating oil is NOT volatile.
so people can use oil in a different way
Friction is not lubricating. Lubrication diminishes friction.
you put it on the bow not the strings it is called rosin