Maintenance Schedule; When To Change Engine Oil - GMC Safari 2003 Owner's Manual

When to Change Engine Oil

If any one of these are true for you, use the short
trip/city maintenance schedule:
•
Most trips are less than 5 miles (8 km). This is
particularly important when outside temperatures
are below freezing.
•
Most trips include extensive idling (such as frequent
driving in stop-and-go traffic).
•
You frequently tow a trailer or use a carrier on top
of your vehicle.
•
The vehicle is used for delivery service, police, taxi
or other commercial application.
5-18
Driving under these conditions causes engine oil to
break down sooner. If any one of these is true for your
vehicle, then you need to change your oil and filter
every 3,000 miles (5 000 km) or 3 months — whichever
occurs first.
If none of them is true, use the long trip/highway
maintenance schedule. Change the oil and filter every
7,500 miles (12 500 km) or 12 months — whichever
occurs first. Driving a vehicle with a fully warmed engine
under highway conditions will cause engine oil to
break down slower.