2007 Hummer H3 Owner's Manual - Page 101

Starting and Operating Your Vehicle New Vehicle Break-In Notice: Your vehicle does not need an elaborate break-in. But it will perform better in the long run if you follow these guidelines: • Keep your speed at 55 mph (88 km/h) or less for the first 500 miles (805 km). • Do not drive at any one constant speed, fast or slow, for the first 500 miles (805 km). Do not make full-throttle starts. Avoid downshifting to brake, or slow, the vehicle. • Avoid making hard stops for the first 200 miles (322 km) or so. During this time your new brake linings are not yet broken in. Hard stops with new linings can mean premature wear and earlier replacement. Follow this breaking-in guideline every time you get new brake linings. • Do not tow a trailer during break-in. See Towing a Trailer on page 297 for the trailer towing capabilities of your vehicle and more information. Following break-in, engine speed and load can be gradually increased. Ignition Positions With the key in the ignition switch, you can turn to four different positions. LOCK (A): This position locks the ignition. It also locks the transmission on automatic transmission vehicles. It will locks the steering wheel on manual transmission vehicles when the key is removed. It is a theft-deterrent feature. You will only be able to remove your key when the ignition is turned to LOCK. If you have an automatic transmission, the ignition switch cannot be turned to LOCK unless the shift lever is in PARK (P). 101