See also:

SI-DRIVE (STI)
SI-DRIVE (SUBARU Intelligent Drive) works to maximize engine performance, control and efficiency. This system consists of three modes: Intelligent (I), Sport (S), and Sport Sharp (S#). By adjusting ...

Synthetic oil
You should use synthetic engine oil that meets the same requirements given for conventional engine oil. When using synthetic oil, you must use oil of the same classification, viscosity and grade shown ...

Turbocharged Power
The 2.5-liter four-cylinder engine from last year's WRX really is a hoot to drive, and it's just as strong in the 2009 Impreza 2.5GT. Whether you're cruising around the city or driving on the high ...