2009 Subaru Outback Owner's Manual - Page 384

11-34 Maintenance and service or icy roads, we strongly recommend the use of winter (snow) tires. When installing winter tires, be sure to replace all four tires. ! Winter (snow) tires Winter tires are best suited for driving on snow-covered and icy roads. However winter tires do not perform as well as summer tires and all season tires on roads other than snow-covered and icy roads. & Tire pressure monitoring system (TPMS) (if equipped) The tire pressure monitoring system provides the driver with a warning message by sending a signal from a sensor that is installed in each wheel when tire pressure is severely low. The tire pressure monitoring system will activate only when the vehicle is driven. Also, this system may not react immediately to a sudden drop in tire pressure (for example, a blow-out caused by running over a sharp object). If you adjust the tire pressures in a warm garage and will then drive the vehicle in cold outside air, the resulting drop in tire pressures may cause the low tire pressure warning light to illuminate. To avoid this problem when adjusting the tire pressures in a warm garage, inflate the tires to pressures higher than those shown on the tire placard. Specifically, inflate them by an extra 1 psi (6.9 kPa, 0.07 kgf/cm2) for every difference of 108F (5.68C) between the temperature in the garage and the temperature outside. By way of example, the following table shows the required tire pressures that correspond to various outside temperatures when the temperature in the garage is 608F (15.68C). Example: Tire size: P225/55R17 95V, P225/60R16 97H Standard tire pressures: Front: 32 psi (220 kPa, 2.2 kgf/cm2) Rear: 30 psi (210 kPa, 2.1 kgf/cm2) Garage temperature: 608F (15.68C) Outside temperature 308F (−18C) 108F (−128C) −108F (−238C) Adjusted pressure [psi (kPa, kgf/cm2)] front 35 (240, 2.4) 37 (255, 2.55) rear 33 (230, 2.3) 35 (240, 2.4) Garage temperature: 608F (15.68C) Outside temperature 308F (−18C) 108F (−128C) −108F (−238C) Adjusted pressure [psi (kPa, kgf/cm2)] front 38 (265, 2.65) 40 (280, 2.8) 42 (295, 2.95) rear 36 (250, 2.5) 38 (265, 2.65) 40 (280, 2.8) Example: Tire size: 215/45R18 89Y, P215/45R18 89W, P205/50R17 88V Standard tire pressures: Front: 33 psi (230 kPa, 2.3 kgf/cm2) Rear: 32 psi (220 kPa, 2.2 kgf/cm2) Garage temperature: 608F (15.68C) Outside temperature 308F (−18C) 108F (−128C) −108F (−238C) Adjusted pressure [psi (kPa, kgf/cm2)] front 36 (250, 2.5) 38 (265, 2.65) 40 (280, 2.8) rear 35 (240, 2.4) 37 (255, 2.55) 39 (270, 2.7) 39 (270, 2.7) 37 (255, 2.55) Example: Tire size: 215/45R17 91W Standard tire pressures: Front: 35 psi (240 kPa, 2.4 kgf/cm2) Rear: 33 psi (230 kPa, 2.3 kgf/cm2) If the low tire pressure warning light illuminates when you drive the vehicle in cold outside air after adjusting the tire