2005 Cadillac XLR Owner's Manual - Page 361

Inflation - Tire Pressure {CAUTION: Run-flat tires are constructed differently than other tires and could explode during improper service. You or others could be injured or killed if you attempt to repair, replace, dismount, or mount a run-flat tire. Let only an authorized run-flat service center repair, replace, dismount and mount run-flat tires. The valve stems on your run-flat tires have sensors that are part of the Tire Pressure Monitor System (TPMS). See Tire Pressure Monitor System on page 6-55. These sensors contain batteries which are designed to last for 10 years under normal driving conditions. See your dealer if you ever need to have a wheel replaced, or if the sensors ever need replacement. Notice: Using liquid sealants can damage the tire valves and tire pressure monitor sensors in your run-flat tires. This damage would not be covered by warranty. Don't use liquid sealants in your run-flat tires. Tires need the correct amount of air pressure to operate effectively. Notice: Do not let anyone tell you that under-inflation or over-inflation is all right. It is not. If your tires do not have enough air (under-inflation), you can get the following: Too much flexing Too much heat Tire overloading Premature or irregular wear Poor handling Reduced fuel economy If your tires have too much air (over-inflation), you can get the following: Unusual wear Poor handling Rough ride Needless damage from road hazards 6-53