GMC 2003 Envoy - Manual (Page 313)

As In l+ie chart sho^fn previously, SAE SW-30 is the
only viscosity grade recommended for your vehJcEs.
You should [Dok for and use only oils which have [he
API Slarhurst symbol and which are also identiHed
as SAE SW-30j II you cannot find such SAE SW-30 oils,
you can use an SAE tOW-30 oil which has the API
StarbuTSl symbol, d It's going ici be D^F (-13'C)
or above. Do not use other viscosity grada oilSp such as
SAE 10W-40 or SAE 20W-5O under aiiy condilions,
Notice: Use only engine nlF with the American
Petroleum Instituie Certified For Gasoline Engines
starburst symbol Failure to use the rqcommendBd
oil can reault fn engine damage not covered by
your warranty.
GM Good wrench® ell meets all 1 he requireinenis tor
your vehicle.
li you are In an area of exlreme cold, where [he
tempera!ure falls below -20''F (-29'’C). it Is
recommended lhat you use eilher an SAE 5W-30
synthatic oil or an SA£ OW'30 oil, Both will provide
easier cold eiariing and betler proiecllon for youi engine
□1 extremely low tomporaturcs.
Don'! add anything lo your oil, The iecemmended oils
With the stsrburst symbol are all you will need for
good performance and engine prolechon
When to Change Engine Oil (GM Oil
Life System)
Your vehida has a compuier system that lels you know
when to change The enging oil and filler. This is
based on angine revolutions and engine temperature,
and not on mileage Based on driving conditions,
ItiQ mileage ai which an oil change will be indicaled can
vary considerably. For ihe oil life sysTeim to work
properly, you must reset the system every [[П>е Ihe oil
is changed.
When the syslem hae calculaled' thal oil hie has been
diminished, IT will indicate that an oil change is
necessary. A CHANGE ENG OIL light In the Dnver
Infoiimation Center (DIG) will come on. Change your oii
as soon Bs possible within the next two times у eu
stop lor iuel. It is possible thal, if you are driving under
the best corrdilions, Ihe oil life system may nol
indicate that an oil change is naces&ary Tor over a year
Engine Oil Additives
5’ta