Engine Oil Additives; When to Change Engine Oil (GM Oil Life System_); When to Change Engine Oil - Page 270

6-16

If you are in an area where the temperature falls below

-

20

_

F (

-

29

_

C), consider using either an SAE 5W

-

30

synthetic oil or an SAE 0W

-

30 oil. Both will provide

easier cold starting and better protection for your engine
at extremely low temperatures.

Engine Oil Additives

Don’t add anything to your oil. The recommended oils
with the starburst symbol are all you will need for good
performance and engine protection.

When to Change Engine Oil 
(GM Oil Life System

t

)

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 OIL SOON light 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.