2009 Subaru Impreza Owner's Manual - Page 284

Driving tips 8-11 through use of tires designed specifically for winter driving conditions. When you choose to install winter tires on your vehicle, be sure to use the correct tire size and type. You must install four winter tires that are of the same size, construction, brand and load range and you should never mix radial, belted bias or bias tires since this may result in dangerous handling characteristics. When you choose a tire, make sure that there is enough clearance between the tire and vehicle body. Remember to drive with care at all times regardless of the type of tires on your vehicle. ! WRX STI Your vehicle is equipped with "summer tires" as original equipment, which are inadequate for driving on slippery roads such as on snow-covered or icy roads. Compared with winter and all-season tires, summer tires give significantly less grip on snowy and icy road surfaces. Therefore, use of winter tires is strongly recommended when driving with such road conditions. When you choose to install winter tires on your vehicle, be sure to use the correct tire size and type. You must install four winter tires that are of the same size, construc- tion, brand and load range and you should never mix radial, belted bias or bias tires since this may result in dangerous handling characteristics. When you choose a tire, make sure that there is enough clearance between the tire and vehicle body. Remember to drive with care at all times regardless of the type of tires on your vehicle. & Rocking the vehicle If you must rock the vehicle to free it from snow, sand, or mud, depress the accelerator pedal slightly and move the selector lever back and forth between "D" and "R" repeatedly. Do not race the engine. For the best possible traction, avoid spinning the wheels when trying to free the vehicle. When the road surface is extremely slippery, you can obtain better traction by starting the vehicle with the transmission in 2nd than 1st (both for MT and AT). For information about holding the transmission in 2nd position, refer to "Selection of manual mode" F7-26. & Tire chains CAUTION Tire chains cannot be used on any tires for your Impreza and WRX STI because of lack of clearance between the tires and vehicle body.