Engine Oil; Engine Specifications - Volvo 2007 S40 Owner's Manual

Extreme engine operation
Synthetic oils meeting SAE 0W-30 or 0W-40 and complying with oil quality requirements are recommended for driving
in areas of sustained temperature extremes (hot or cold), when towing a trailer over long distances, and for prolonged
driving in mountainous areas.
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See the information on page 232.
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11 Specifications

Engine oil

American Petroleum Institute (API) symbol
The API Service Symbol "donut" is divided into three parts:
The upper section describes the oil's performance 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
comparison to a reference oil.
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11 Specifications

Engine specifications