2006 Lexus GS 300 Owners Manual - Page 580

CHASSIS The effectiveness of snow tires is lost if the tread wears down below 4 mm (0.16 in.). If you have tire damage such as cuts, splits, cracks deep enough to expose the fabric, or bulges indicating internal damage, the tire should be replaced. If a tire often goes flat or cannot be properly repaired due to the size or location of a cut or other damage, it should be replaced. If you are not sure, consult with your Lexus dealer. If air loss occurs while driving, do not continue driving. Driving even a short distance can damage a tire beyond repair. Any tires which are over 6 years old must be checked by a qualified technician even if damage is not obvious. Tires deteriorate with age even if they have never or seldom been used. This applies also to the spare tire and tires stored for future use. NOTICE D When you purchase new tires, consult your Lexus dealer. If you change from run−flat tires to standard tires, a spare tire should also be equipped. D When the tires must be repaired or replaced, have them repaired or replaced by Lexus dealer or authorized dealer. The tire pressure sensors will be affected by the installation or removal of tires. D When the tires must be replaced, replace the grommets for tire pressure sensors as well. 556