GM Service Manual Online
For 1990-2009 cars only

Checking Engine Oil

It is a good idea to check the engine oil every time you get fuel. In order to get an accurate reading, the oil must be warm and the vehicle must be on level ground.

The engine oil dipstick handle is a yellow loop. See Engine Compartment Overview for the location of the engine oil dipstick.

  1. Turn off the engine and give the oil several minutes to drain back into the oil pan. If you do not do this, the oil dipstick might not show the actual level.
  2. Pull the dipstick and clean it with a paper towel or cloth, then push it back in all the way. Remove it again, keeping the tip down and check the level.

When to Add Engine Oil


Object Number: 806205  Size: B1

If the oil is below the MIN (minimum) mark, add at least one quart/liter of the recommended oil. This section explains what kind of oil to use. For engine oil crankcase capacity, see Capacities and Specifications .

Notice: Do not add too much oil. If the engine has so much oil that the oil level gets above the upper mark that shows the proper operating range, the engine could be damaged.


Object Number: 1391076  Size: A2

See Engine Compartment Overview for the location of the engine oil fill cap.

Add enough oil to put the level somewhere in the proper operating range. Push the dipstick all the way back in when you are through.

What Kind of Engine Oil to Use

Look for three things:


Object Number: 1506636  Size: B4
    • GM4718M
        Your vehicle's engine requires a special oil meeting standard GM4718M, such as Mobil 1® or equivalent. Oils meeting this standard may be identified as synthetic. However, not all synthetic oils will meet this standard. Use only an oil that meets standard GM4718M.

       Notice: Using oils that do not have the GM4718M Standard designation can cause engine damage not covered by the vehicle warranty.

    • SAE 5W-30
        SAE 5W-30 is best for the vehicle. These numbers on an oil container show its viscosity, or thickness. Do not use other viscosity oils such as SAE 20W-50.
    • American Petroleum Institute (API) starburst symbol

Object Number: 808500  Size: A2

Oils meeting these requirements should have the starburst symbol on the container. This symbol indicates that the oil has been certified by the American Petroleum Institute (API).

Your vehicle's engine is filled at the factory with a synthetic oil which meets all requirements for your vehicle.

Substitute Engine Oil: When adding oil to maintain engine oil level, oil meeting standard GM4718M may not be available. You can add substitute oil designated SAE 5W-30 with the starburst symbol at all temperatures. Substitute oil not meeting standard GM4718M should not be used for an oil change.

Engine Oil Additives

Do not add anything to the oil. The recommended oils with the starburst symbol that meet standard GM4718M are all you need for good performance and engine protection.