Selecting The Right Schedule - Buick 1994 Century Owner's Manual

Selecting the Right Schedule
First you'll need to decide which of the two schedules is
right for your vehicle. Here's how to decide which
schedule to follow:
Schedule I
Is any one of these true for your vehicle?
Most trips are less than 4 miles (6
km).
0
Most trips are less than 10 miles (16 km) when
outside temperatures are below fi-eezing.
The engine is at low speed most of the time (as in
You operate your vehicle in dusty areas.
You tow a trailer.
door-to-door delivery, or in stop-and-go traffic).
If any one (or more) of these is true for your driving,
follow Schedule I.
Schedule I1
Follow Schedule I1 only if none of the above conditions
is true.