1993 Chevrolet Suburban Owner's Manual - Page 342

r CLASSIFICATION EMISSIONS ENGINE Enaine Description VIN Code 4.3LV6TTBI Z with8500GVWRandbelow with8501GVWRandabove 5.0L V8TTBI H K 5.7L V8TTBI with8500 G W R andbelow with8501GVWRandabove 6.2L V8IDiesel C 6.2L V8IDiesel J 6.5L V8IDiesel F 7.4L V8/TBI N .Except 454 SS Model with454 SS Model L Emissions LD HD LD LD HD LD HD HD HD LD TO268 I I NOTE: TBI isathrottlebodyinjectionsystem. Selecting the Proper Maintenance Schedule Here is how to tell whichschedule to followonceyoufindtheproper maintenancechart to use. MAINTENANCESCHEDULE I Is anyoneofthese Mosttripsare true for your vehicle? less than4miles (6 kilometers). Mosttripsare less than 10 miles(16kilometers),andtheoutside temperatures are below freezing. Theengine is at low speedmost of thetime(as stop-and-gotraffic,orcommercialuse). You operate in dustyareasoroff-roadfrequently. You tow a trailer If anyone(ormore) of these is trueforyourdriving, follow Schedule I. Schedule 1 isshown by aplus sign (t) on thechart. in door-to-doordelivery, MAINTENANCESCHEDULE II FollowSchedule II ONLY if none of theaboveconditionsaretrue.Schedule II is shown by a dot (.) onthechart. 7-5