1994 Buick Skylark Owner's Manual - Page 261

Selecting the Right Schedule First you'll need to decide which the two schedules is of right for your vehicle. Here's how decide which to schedule to follow: The engine isat low speed most of the time (as in door-to-door delivery, or in stop-and-go traffic). *Youoperate your vehicle in dusty areas. You tow a trailer. (With some models, you shouldn't ever tow a trailer. See "Towing a Trailer" in the Index.) If any one (or more) of these is true for your driving, follow Schedule I. Schedule I Is any one of these truefor your vehicle? 0 Most trips are less than 4 miles (6 km). 0 Most trips are less than 10 miles (16 km) when outside temperaturesare below freezing. Schedule I1 Follow ScheduleI1 only if none of the above conditions is true.