First, you don't say whether you're using dino or synthetic engine oil,
but if its synthetic oil, forgetaboutit! Synthetic should easily last
until 7000 miles before you need changing. Changing any time before is
probably a waste of money.
IF you're using dino oil, why do you think you need to change it so
soon? Are you burning any oil? Has it changed color. Even the most
paranoid, like myself, usually wait until 3000-4000 miles before
changing dino oil. Unless something is out of the ordinary, which you
don't state, save your money and just drive!