A 2003 Chevy Suburban typically requires a
1/2-inch drive wrench to remove the oil drain plug. However, you might need a
socket rather than just an open-ended wrench for better grip and ease of use. A socket wrench set usually comes with a 1/2-inch drive ratchet and various sized sockets.
It's always a good idea to double-check your specific Suburban's owner's manual to confirm the correct size. The manual will provide detailed instructions for an oil change including the correct wrench size.
