My kitchenaid stand mixer is leaking oil

First off -- if it's still under warrantee, you'll want to go to kitchenaid.com and find the nearest service center. The next thing I say starts with "void the warrantee" steps. :)

It's very simple to open a stand mixer to see if you've got a simple problem or a bad one.

Unplug it.

Follow the aluminum "Kitchen Aid" band to the back of the unit, there's one main screw. Remove this, and set it aside with the band which should come right off at this point.

Now, there should be two screws on each side of the unit where the band used to be. Remove each of these. They're all identical, so no worries if you mix them up.

Now you can lift the top off of the unit and see inside. The motor is at the back of the unit, the gear box at the front is where the oil is coming from. Try (GENTLY) to tighten the screws that hold the gearbox together. With a little luck, the gearbox screws had come loose and it was oozing oil out through the seals. If they're all firm, then you've got more serious problems and you'll want to find a service center for it.

Good luck!