Lubrication: reduce friction and abrasion by creating a considerable thickness of oil between the moving parts
• Reduce the heat: reducing the heat generated from moving surfaces
• Act like a bumper: has the ability of reduce the strike of the moving part of the machine
• Protect the surfaces: lubricate would protect metal surfaces from corrosion and rustiness
• Sealing: creating a layer of oil between piston and cylinder
• Carry the particles: lubricate must be able to carry the particle created from abrasion and decomposition of different parts
• Power transmission: sometimes the oil play a part in transferring power (hydraulic fluids)




