API donut
nounUK /ˌeɪpiːaɪ ˈdəʊnʌt/ · US /ˌeɪpiaɪ ˈdoʊ(ˌ)nʌt/
Etymology From API + donut; from American Petroleum Institute, and its shape.
1
Automotive, Transport, Vehicles US 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).
- Synonyms
- API Service Symbol, API service symbol