2003 Subaru Legacy Owner's Manual - Page 385
2003 Subaru Legacy Manual
Page 385 highlights
Maintenance and service New API Certification Mark (Starburst Mark) 1 Indicates the oil quality by API desig2 Indicates the SAE oil viscosity grade 3 Indicates that the oil has fuel saving capabilities nations 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 recommended 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 recommended by SUBARU. Engine oil viscosity (thickness) affects fuel economy. Oils of lower viscosity 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 11 OM-H2756 - CONTINUED - 11-13