1999 GMC Sierra 1500 Pickup Owner's Manual - Page 385

~~~ VIN Code Z H K C J F V8/TBI N Engine Description 4.3L V6/TBI with 8500 GVWR and below 7~ . with 8501 GWVR and' above 5.0L V8/TBI 5.7L V8/TBI with8500 GVWR and belowk= with8501GVWRandabov-sd J = tb6.2L V8IDiesel L . >c< 6.2L V8/Diesel V8/Diesel 6.5L g$ 7.4L Except 454 SS Model with454 SS Model ; ! c *&$ LD 'g I HD LD HD LD HD HD HD LD TO268 1 - L . . NOTE:TBI I s a throttle body injection system. Selecting the Proper Maintenance Schedule Here ,is how to tell whichschedule to follow once you find the proper maintenancechart to use. MAINTENANCESCHEDULE I Is any one of these true for your vehicle? Most tripsarelessthan4miles(6kilometers). Most tripsarelessthan 1.0 miles(16kilometers),andtheoutside temperatures are below freezing. Theengine is atlowspeedmostof thetime(asindoor-to-doordelivery, stop-and-gotraffic, or commercialuse). You operateindustyareasoroff-roadfrequently. You tow a trailer . .1 . >.' : ---. n;r- . I '. + - -- L r- IA P ~ l m. : * ~ If anyone(ormore)ofthese is true for your driving, follow Schedule Schedule I is shown by a plus sign (t)on chart. the MAINTENANCESCHEDULE II 1. & .. I L - Follow Schedule II ONLY if none of the above conditions are true. Scheduleby II is shown chart. (.) on the 7-5