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I just used the 04 as an example since someone mentioned it, 6 qts. I assume all of the 2v 4.6L GT engines are the same but again, I'm new so I'm just assuming. I double checked and the 02 says the same.
Well I don't know how this engine works (just got my car), but it's unlikely you dumped every drop of oil when you changed it so you probably have enough. Just take a look at the dipstick and see how the level looks, if it says you're fine then you're good.