2003 Chevrolet Tahoe Owner's Manual - Page 371

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 yellow ring handle and is located in the engine compartment on the passenger's side of the vehicle. See Engine Compartment Overview on page 5-74for more information on location. 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. 8.1 L Engine 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. ~ All Other Engines 5-18