TrailBlazer 2WD L6-4.2L VIN S (2003)
Engine Oil: Description and Operation
Api Oil and Additives
WHAT KIND OF ENGINE OIL TO USE
Oils recommended for your vehicle can be identified by looking for the starburst symbol.
This symbol indicates that the oil has been certified by the American Petroleum Institute (API). Do not use any oil which does not carry this starburst
symbol.
If you choose to perform the engine oil change service yourself, be sure the oil you use has the starburst symbol on the front of the oil container. If you
have your oil changed for you, be sure the oil put into your engine is American Petroleum Institute certified for gasoline engines.
You should also use the proper viscosity oil for your vehicle, as shown in the viscosity chart.
As in the chart shown previously, SAE 5W-30 is the only viscosity grade recommended for your vehicle. You should look for and use only oils which
have the API Starburst symbol and which are also identified as SAE 5W-30. If you cannot find such SAE 5W-30 oils, you can use an SAE 10W-30 oil
which has the API Starburst symbol, if it's going to be 0°F (-18°C) or above. Do not use other viscosity grade oils, such as SAE 10W-40 or SAE 20W-50
under any conditions.
NOTICE:
Use only engine oil with the American Petroleum Institute Certified For Gasoline Engines starburst symbol. Failure to use the
recommended oil can result in engine damage not covered by your warranty.
GM Goodwrench® oil meets all the requirements for your vehicle.
If you are in an area of extreme cold, where the temperature falls below -20°F (-29°C), it is recommended that you use 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.
