Scheduled MaintenanceWhen the CHANGE ENGINE OIL SOON messagecomes on, it means that service is required for yourvehicle. Have your vehicle serviced as soon aspossible within the next 600 miles (1 000 km). It ispossible that, if you are driving under the bestconditions, the engine oil life system may notindicate that vehicle service is necessary for over ayear. However, the engine oil and filter must bechanged at least once a year and at this time thesystem must be reset. Your GM Goodwrench®dealer has GM-trained service technicians who willperform this work using genuine GM parts and resetthe system.If the engine oil life system is ever resetaccidentally, you must service your vehicle within3,000 miles (5 000 km) since your last service.Remember to reset the oil life system wheneverthe oil is changed. See Engine Oil Life System onpage 363 for information on the Engine Oil LifeSystem and resetting the system.When the CHANGE ENGINE OIL SOON messageappears, certain services, checks, and inspectionsare required. Required services are describedin the following for “Maintenance I” and“Maintenance II.” Generally, it is recommendedthat your first service be Maintenance I, yoursecond service be Maintenance II, and that youalternate Maintenance I and Maintenance IIthereafter. However, in some cases,Maintenance II may be required more often.Maintenance I — Use Maintenance I if theCHANGE ENGINE OIL SOON message comes onwithin 10 months since the vehicle was purchasedor Maintenance II was performed.Maintenance II — Use Maintenance II if theprevious service performed was Maintenance I.Always use Maintenance II whenever the messagecomes on 10 months or more since the lastservice or if the message has not come on at allfor one year.471
