API donut
(US, automotive) An information table found on cans of motor oil, conforming to U.S.
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#1·Apr 27, 2026
(US, automotive) An information table found on cans of motor oil, conforming to U.S. standards, which indicates the weight (viscosity) and type of oil. The central circle provides the oil viscosity rating (ie. 10W50), while the upper annulus section provides the oil type (ie. SP).
Origin: From ; from American Petroleum Institute, and its shape. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
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