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– G –

Graphite – A crystalline form of carbon either natural or synthetic in origin, which is used as a lubricant.

Gravity – See Specific Gravity, API Gravity

Grease – A lubricant composed of an oil or oils thickened with a soap, or other thickener to a solid or semi-solid consistency.

Gum – A rubber-like, sticky deposit black or dark brown in color, which results from the oxidation of lubricating oils in service.

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