Cadillac 2005 STS Specifications download pdf (Page 398)

Scheduled Maintenance

When the CHANGE ENGINE OIL SOON message in

the Driver Information Center (DIC) comes on, it means

that service is required for your vehicle. Have your

vehicle serviced as soon as possible within the next

600 miles (1 000 km). It is possible that, if you are

driving under the best conditions, the engine oil life

system may not indicate that vehicle service is

necessary for over a year. However, your engine oil and

ﬁlter must be changed at least once a year and at

this time the system must be reset. Your GM

Goodwrench dealer has GM-trained service technicians

who will perform this work using genuine GM parts

and reset the system.

If the engine oil life system is ever reset accidentally,

you must service your vehicle within 3,000 miles

(5 000 km) since your last service. Remember to reset

the oil life system whenever the oil is changed. See

Engine Oil Life System on page 5-19 for information on

the Engine Oil Life System and resetting the system.

When the CHANGE ENGINE OIL SOON message

appears, certain services, checks and inspections are

required. Required services are described in the following

for “Maintenance I” and “Maintenance II.” Generally, it is

recommended that your ﬁrst service be Maintenance I,

your second service be Maintenance II and that you

alternate Maintenance I and Maintenance II thereafter.

However, in some cases, Maintenance II may be

required more often.

Maintenance I — Use Maintenance I if the CHANGE

ENGINE OIL SOON message comes on within

10 months since the vehicle was purchased or

Maintenance II was performed.

Maintenance II — Use Maintenance II if the previous

service performed was Maintenance I. Always use

Maintenance II whenever the message comes on

10 months or more since the last service or if the

message has not come on at all for one year.

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Cadillac 2005 STS Specifications Page 398