API donut

English

Etymology

From API +‎ donut; from American Petroleum Institute, and its shape.

Noun

API donut (plural API donuts)

  1. (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).

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