GM Service Manual Online
For 1990-2009 cars only

Notice: One of the reasons you should follow the Short Trip/City schedule, if you operate your vehicle under any of these conditions, is that these conditions cause engine oil to break down sooner.

    • Most trips are less than 8-16 km (5-10 mi). This is particularly important when outside temperatures are below freezing.
    • Most trips include extensive idling and/or low speed operation (such as door-to-door delivery and frequent driving in stop-and-go traffic).
    • Most trips are through dusty areas.
    • The vehicle frequently tows a trailer.
    • The vehicle operates at or near the maximum Gross Vehicle Weight (GVW) ratings.
    • The vehicle operates in hilly or mountainous terrain.