A 2003 Chevrolet Tahoe with a 5.3 liter engine takes 6.0 quarts (oil filter should be changed at every oil change).
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. 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 the dipstick and clean it with a paper towel or cloth, then push it back all the way. Remove it again, keeping the tip down, and check the level.
If the oil is at or below the cross-hatched area at the tip of the dipstick, then you'll need to add at least one quart of oil. Don't add too much oil. If your engine has so much oil that the oil level gets above the cross-hatched area that shows the proper operating range, your engine could be damaged.
View the 2003 Chevrolet Tahoe's owner’s manual.
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Tip! Follow Popular Mechanics guide on how to pick the right motor oil for your car.