How many quarts of oil does the GT hold

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They think since it says 10-15k miles before replacement for the oil filter that they dont have to replace it every 3k miles as they change the oil. What they dont know is that old oil filter is holding 1qt of bad oil and will contaminate the rest of the oil on start up....so why change your oil in the first place right?? I have been buying the K&N filter for $12 and the Castrol full synthetic for $4.50qt...I switched from Mobil1 since John Force sponsors Castrol..it has to be good. =)
 
You added 6qts with a new oil filter?
How long are you letting the car sit before checking the stick? Are you on level ground?
Also the 4.6L engine really needs to be at the full mark or the valvetrain does not get enough lube.
 
The dipsticks are mismarked. Ford issued a TSB for this a few years ago, warning not to overfill. 6.0 qts is correct for the '03 GT.

I can post a link to the TSB. You can also find it at the Mach1 registry web site.