What is the Oil capacity gmc truck 2003 v8 5.3 liter?

According to ALLDATA, 5 quarts without filter, 6 quarts with filter (you should always change the filter). However, I'm picky....So I would

Drain the oil

Change the filter

Put the Plug back in the oil pan

Add 5qts

Start the truck and run for 30seconds or so (check for leaks)

Shut it down

Wait a few minutes

Check the oil level and top it off so it's just to the full mark (you may need to wait a few minutes between adding oil and checking the level for the oil to make it to the pan).

Write down exactly how much oil it took--so you won't have to go though the process again. I used to work in an oil changing shop while in College (and grew up working on cars). The 'book' oil capacity is rarely 100% correct (but usually close enough) Something with the 5 quart/6 quart spec isn't accurate....no way that filter holds a full quart.