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11 Specifications
Engine oil
American Petroleum Institute (API)
symbol
11
American Petroleum Institute (API) symbol
The API Service Symbol "donut" is divided
into three parts:
• The upper section describes the oil's per-
formance level.
• The center identifies the oil's viscosity.
• The lower section indicates whether the oil
has demonstrated energy-conserving
properties in a standard test in compari-
son to a reference oil.
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