When to Change Engine Oil (Vehicles Withthe GM Oil Life System_ Option); How to Reset the Oil Life System (If Equipped); When to Change Engine Oil (Vehicles With- Page 287

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When to Change Engine Oil (Vehicles With
the GM Oil Life System

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 Option)

If so equipped, your vehicle has a computer system 
that lets you know when to change the engine oil and
filter. This is based on engine revolutions and engine
temperature, and not on mileage. Based on driving
conditions, the mileage at which an oil change will be
indicated can vary considerably. For the oil life system
to work properly, you must reset the system every time
the oil is changed.

When the system has calculated that oil life has been
diminished, it will indicate that an oil change is
necessary. A CHANGE ENGINE OIL SOON message
will come on. Change your oil as soon as possible
within the next two times you stop for fuel. It is possible
that, if you are driving under the best conditions, the oil
life system may not indicate that an oil change 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. It is also important to
check your oil regularly and keep it at the proper level.

If the system is ever reset accidentally, you must change
your oil at 3,000 miles (5 000 km) since your last oil
change. Remember to reset the oil life system whenever
the oil is changed.

How to Reset the Oil Life System (If Equipped)

The GM Oil Life System

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 calculates when to change

your engine oil and filter based on vehicle use. Anytime
your oil is changed, reset the system so it can calculate
when the next oil change is required. If a situation
occurs where you change your oil prior to a CHANGE
ENGINE OIL SOON message being turned on, reset 
the system.

To reset the Oil Life System, do the following:

1. Display the OIL LIFE INDEX on the DIC.

2. Press and hold the RESET button on the DIC 

for more than five seconds. The oil life will change
to 100%.