Why does my brand new prehung door creak every time I open it?

Don't loosen the middle hinge screws yet, that rarely fixes this kind of thing and can make the reveal go wonky. A creak that runs thru the whole swing usally means the hinge knuckles are binding under load, not just running dry. Dry lube on the pin helps for a day, then the pressure squeezes it right back out, which is exactly what you're seeing. First, find which hinge it is. Open the door slowly and hold a long screwdriver against each hinge barrel, with the handle end pressed to your ear like a stethoscope. You'll hear it loud and clear on the guilty one. Nine times out of ten it's the top hinge on a bedroom door, expecially if it's a heavier slab.

Once you know which one, check wheather the hinge leaf is rubbing on itself or the door is pulling against the jamb. A jamb can look plumb on the face and still be twisted slightly out of plane front to back, which squeezes the knuckles together through the swing. Loosen the screws on the problem hinge just enough to move it, slip a thin shim behind the leaf on the jamb side if it needs to come out a hair, and retighten. Also try swapping in a longer screw at the top hinge, one long enough to reach the stud behind the jamb, and snug it down a bit. If the creak changes or quiets, the door slab was sagging on that hinge and loading the knuckles. That's a common thing with prehung doors even when the gaps look even all around.

If the hinge itself turns out to be the culprit, pop the pin and coat it with white lithium grease instead of the dry stuff. It stays put under load way better. And check the hinge leaves aren't mortised too deep or too shallow in either the jamb or the door edge. If one leaf sits proud, the leaves press against each other mid-swing and groan the whole way. Back that hinge out with a shim or deepen the mortise a touch and it'll go quiet for good.

I had somethig similar happen with a screen door, and it wasn't the hinges that were causing the noise. Mine made this sort of subtle, high pitched sound right when the slab made contact with the frame. I'm wondering if it is posible the door just isn't sitting flush against the jamb everywhere? Even if the hinges feel totally solid, the slab might be riding slightly off the frame on one side, causing that friction noise.

You gotta look past the hinges for a minute and check the strike side. When I did some of this work years ago, I found the noise often wasn't the hinge at all, but the latch hitting the strike plate wrong. Even if the door is flush, if the mortise in the jamb is chipped or cut too shallow, that latch has to slam or wiggle a bit. Try checking the alignment of the strike plate itself. It often takes just a hair of adjustment to let the latch slide in without that screeching sound.

I agree with the idea that it could just be the door sitting slightly off the jamb, even if the gaps look even. When you get a creak that runs the whole way, it often suggests something is flexing or binding as it moves. I had this exact issue once on an interior door and realized the problem wasn't the hinges at all. It was the weatherstripping compression. We replaced the thin strip around the frame and that whole low groan disappeared immediatly. Sometimes the slight movement of the door under its own weight is just enough to compress the foam.

I never thought of checking under the door itself for this. Sometimes when a door is really heavy, it feels like the bottom edge might be catching on the floor or the piece the door rests on when it moves. Maybe it just needs a tiny tweak so the floor isn't pushing against the bottom of the door when it swings. I also wondered if the whole frame could be twisted even if the hinges seem fine. Does the gap between the door and the floor look the same all the way around when the door is completly shut?

Update: turns out the first reply had it right. It was the knuckles binding under the weight of the slab, not anything rubbing in the frame. I pulled the door, hit all three hinges with a bit of wax where the knuckles meet, worked the swing a few times before hanging it back up. Quiet since, reveal still even. Not going anywhere near those middle screws.