We are not living in the 80's anymore. 3k oil change intervals is excessive. Today's oils are a lot better than they use to be.
My take on it, I would change my oil every 5k if I was running Fords oil. You can easily run up to 10k on a full synthetic oil such as Amsoil, Royal Purple, Redline, etc.
Also, those of you who keep saying you're running Mobil 1 full synthetic; I hope you bought the extended protection because if you're not, it's not full synthetic. Google it if you think I'm wrong.
SOLD: Black 2011 GT 5.0.
1997 SVT Cobra Mustang
Full Steeda Suspension; OR X-Pipe; Flowmaster Exhaust; AMR wheels; Pro 5.0 Shifter, etc..