
Gear oil is a lubricant made specifically for transmissions, transfer cases, and differentials in automobiles, trucks, and other machinery. It is of a higher viscosity to better protect the gears and usually is associated with a strong sulfur smell. The high viscosity ensures transfer of lubricant throughout the gear train. This is necessary since...
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http://en.wikipedia.org/wiki/Gear_oil

(from the article `petroleum refining`) In gear lubrication the oil separates metal surfaces, reducing friction and wear. Extreme pressures develop in some gears, notably those in the rear ...
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http://www.britannica.com/eb/a-z/g/15

A high-quality oil with good oxidation stability, load-carrying capacity, rust protection, and resistance to foaming, for service in gear housings and enclosed chain drives. Specially formulated industrial EP gear oils are used where highly loaded gear sets or excessive sliding action (as in worm gears) is encountered.
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http://www.encyclo.co.uk/local/21121

See Drive Oil.
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https://steelforge.com/literature/steelog-the-5000-word-metals-glossary/
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