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Wikipedia definition
1. Gear oilGear 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 the devices needing this heavy oil do not have pumps for transferring the oil with only a portion of the lowermost gears bathed in an oil sump.
Read “Gear oil” on English Wikipedia
Read “ギアオイル” on Japanese Wikipedia
Read “Gear oil” on DBpedia

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