Where is the oil drain plug on a 2005 Chevy Avalanche?

The oil drain plug on a 2005 Chevy Avalanche is located on the bottom of the oil pan, which is situated underneath the engine. You'll need to get underneath the vehicle to access it. It's typically a bolt, often 14mm or 15mm, but you should verify the size with your owner's manual or a wrench set. Remember to use a drain pan to collect the old oil.