See also:

Rear differential gear oil
There is no oil level gauge. To check the rear differential gear oil level, we recommend that you consult your SUBARU dealer for inspection. ...

Low tire pressure warning light (U.S.-spec. models)
When the ignition switch is turned to the “ON” position, the low tire pressure warning light will illuminate for approximately 2 seconds to check that the tire pressure monitoring system (TPMS) is f ...

Tire chains
Tire chains cannot be used on your Impreza, WRX and STI because of the lack of clearance between the tires and vehicle body. ...