2006 Subaru Impreza Owner's Manual - Page 314

Aluminum wheels Aluminum wheels can be scratched and damaged easily. Handle them carefully to maintain their appearance, performance, and safety. Intercooler water spray (WRX-STI) Maintenance and service 11-35 When any of the wheels is removed and replaced for tire rotation or to change a flat, always check the tightness of the wheel nuts after driving approximately 600 miles (1,000 km). If any nut is loose, tighten it to the specified torque. Never apply oil to the threaded parts, wheel nuts, or tapered surface of the wheel. Never let the wheel rub against sharp protrusions or curbs. Be sure to fit tire chains on uniformly and completely around the tire, otherwise the chains may scratch the wheel. When wheel nuts, balance weights, or the center cap is replaced, be sure to replace them with genuine SUBARU parts designed for aluminum wheels. Add water to the intercooler water spray tank when the intercooler water spray warning light in the combination meter comes on. The warning light comes on when the water in the tank has decreased to approximately 0.4 liters (0.4 US qt, 0.4 Imp qt). B00462 The tank is located on the right-hand side of the trunk. B00169 NOTE Use only pure water for refilling. In cold weather (when you do not use the intercooler water spray), keep the tank half-empty in case the water freezes. A larger amount of water could break the tank if it froze.