2003 Hummer H2 Owner's Manual - Page 346

Before closing the hood, be sure all the filler caps are on correctly. To close the hood, hold it up a few inches from the closed position and let it go so that it has enough force to engage the hood latch. Pull up on the hood to be sure it is latched. When you are sure the hood latch is engaged, then you can latch both hood side latches. Checking Engine Oil It's a good idea to check your 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 has a loop handle and is located on the passenger's side of the vehicle. See "Engine Compartment Overview" in the Index for more information on location. Engine Oil If the CHECK ENG OIL LEVEL message appears on the instrument cluster, it means you need to check your engine oil level right away. For more information, see "CHECK ENG OIL LEVEL" in the Index. You should check your engine oil level regularly; this is an added reminder. Turn off the engine and give the oil several minutes to drain back into the oil pan. If you don't, the oil dipstick might not show the actual level. Pull out 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. 6-12