I have this problem too -it is rather common if you search the web. There was a suggestion posted on this site about what to do. See http://www.fixya.com/support/t125253-mixer_leaking_oil
I have also read about other people taking it to a Kitchen Aid repair place where they repacked the grease for about $45. I took mine apart and there is gobs of grease around the gears. Right now I am still trying to figure out what to do. I am going to have my father look at it to see what he thinks since he is good with motors. The Kitchen Aid web site says that the grease is FDA approved, so at least it's not going to kill you if a little gets in your food. Their suggestion is to take it out and run it for about 5 minutes at least once a week. They say it leaks if it is not used often enough. That logic doesn't make much sense to me, but you could try it. Mine seems to leak more when I run it because the grease heats up and liquifies more. I hope that helps.
I'll let you know what happens with mine, once it's fixed.
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Kitchenaid says to run it on high speed long enough for it to warm up well, then turn it upside down- I'd leave it upside down overnight. The grease in the gearbox, over time, will separate into oil and heavier grease- mixing them together again and letting them run back to the top of the gearbox should take care of it.
If not, come on back and we'll go through the whole disassembly procedure.
It can be. This may require replaing the plate that the shaft comes through, since there is now enough play to allow the grease that is in the nead to leak through. You can find the parts online, but be ware, it involves tapping out pins and undoing many screws. Manuals are available online at Kitchenaid.com
I went to Kitchen Aid'sKitchen Aid's web site and had an on line chat with a tect support person name Jessica. She told me that if the mixer is not used a small of oil will leak out. to fix the problem you must run the mixer for a few minutes every month or so. This seems to work. Rick