2003 GMC Sonoma Owner's Manual - Page 266

Service Your dealer knows your vehicle best and wants you to be happy with it. We hope you'll go to your dealer for aii your service needs. You'ii get genuine GM parts and GM-trained and supported service people. We hope you'll want to keep your GM vehicle all GM. Genuine GM parts have one of these marks: Doing Your Own Service Work If you want to do some of your own service work, you'll want to use the proper service manual. It tells you much more about how to service your vehicle than this manual can. To order the proper service manual, see Service Publications Ordering Information on page 7-1 1. Your vehicle may have an air bag system. If it does, see Servicing Your Air Bag-Equipped Vehicleon page 7-64 before attempting to do your own service work. 5-3