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Oils lubricate tools and machinery to reduce friction between moving parts. This helps prevent wear and tear on equipment and reduces the risk of overheating. These industrial oils also help block out water, prevent rust, and unstick mated parts and threaded fasteners. Gear oils form a heat- and friction-resistant barrier on gears. Hydraulic oils resist changes in volume and viscosity to power and lubricate hydraulic systems. Machine oils lubricate machinery to keep moving parts from sticking and to reduce machine noise.