1999 Subaru Forester Owner's Manual - Page 304

New tread Worn tread Tread wear indicator HS0201 OM-H0231 A tire should be replaced when the tread wear indicator appears as a solid band across the tread. The indicators appear when the remaining tread has been worn to 0.063 in (1.6 mm) or less. NOTE When any of the wheels is removed and replaced for tire rotation or to change a flat tire, 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. Aluminum wheels (If equipped) Aluminum wheels can be scratched and damaged easily. Handle them carefully to maintain their appearance, performance, and safety. D 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 approximatly 600 miles (1,000 km). If any nut is loose, tighten it to the specified torque. D Never apply oil to the threaded parts, wheel nuts, or tapered surface of the wheel. D Never let the wheel rub against sharp protrusions or curbs. D Be sure to fit tire chains on uniformly and completely around the tire, otherwise the chains may scratch the wheel. D When wheel nuts, balance weights, or the center cap are replaced, 10-42