Pontiac Sunbird Owner's Manual page 258

Schedule I
Is any one of these true for your vehicle?
Most trips are less
than
4 miles (6
km).
Most trips
are less than
1 0 miles (16
km) when outside
temperatures are below freezing.
The engine
is at low speed most of the time (as in door-to-
door delivery, or in stop-and-go traffic).
You operate your vehicle in dusty areas.
If
any one (or moE) of these is true for your driving, follow
Schedule I.
Schedule I 1
Follow Schedule
II
only if none of the above conditions is
true.