Subaru 2003 Legacy Owner's Manual page 385

New API Certification Mark
(Starburst Mark)
In choosing an oil, you want the proper quality and viscosity, as well
as one that will add to fuel economy. The following table lists the rec-
ommended viscosities and applicable temperatures.
When adding oil, different brands may be used together as long as
they are the same API classification and SAE viscosity as those rec-
ommended by SUBARU.
Engine oil viscosity (thickness) affects fuel economy. Oils of lower vis-
cosity provide better fuel economy. However, in hot weather, oil of
higher viscosity is required to properly lubricate the engine.
SAE viscosity numbr and applicable temperature
Maintenance and service
1
Indicates the oil quality by API desig-
nations
2
Indicates the SAE oil viscosity grade
3
Indicates that the oil has fuel saving
capabilities
OM-H2756
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