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There is no oil as such in it. The grease is breaking down through age or not a lot of use and the liquid is separating from the grease solids. The grease is food grade so the liquid is completely harmless. If you don't want to wipe the drips off before you use it then the only solution is to dismantle the gearcase completely, scoop out the old grease and replace it with new stuff. Kitchen Aid will supply a tin of food grade grease as a spare part or a service agent can do the job for you.
They are lubricated with food grade grease, not oil. Any oil dripping out is coming out of the grease as the grease gets older and starts separating liquids from solids.
It sounds like the fuse gear has failed, you need to remove the planetary and the stand. Then split the gear cases by undoing all the screws going up through the bottom of the case, 9x from memory.
Your mixer has a vegetable based lubricating grease in it, that grease can separate from time to time. One way is non use the other way is end of life from normal use.
If you do not use your mixer regularly, get a towel and put it on the counter, get your mixer and turn it upside down on the towel (to protect the finish) turn the mixer on while holding up the mixer (balance it) run the mixer for 2 minutes on speed 6, shut it off and turn the mixer rite side up and turn on again for 2 minutes, then repeat the process at least once. If your mixer continues to leak your lubricant is at end of life and it needs to be replaced along with a new motor housing gasket. KA will service it for you for about $100 dollars, you can do it yourself but it requires a full tear down of the mixer, you may have an "after warranty" service tech in your area but you will have to look for small appliance repair shops. If you do it yourself it will cost you about $20.00 bucks and a roll of paper towels as it is really messy. There are videos on utube that will show you how. The process I described above is a simple re-mix of your existing grease and in at least 60% of mixers I have repaired this is the problem with leaky oil / grease, it will last two or three years before it starts to leak again, longer if you do not use your mixer much, The grease is food safe and will not hurt you or anybody that may eat a recipe that might have a drop in it. But yes; I know it isn't really appealing to have grease dripping in your cooking. So the first thing to do is try and remix your existing grease, then try baking with it, if the drip has stopped your OK for a few years. If not you need to re-pack the grease and change the gasket.
Also the existing gasket is fiber and when the machine is put together the screws that hold the upper and lower motor housing parts together is not torqued down very hard (that is intentional on KA's part), the weight of the upper motor housing is about ten pounds and after years of having the mixer sit on top of the gasket it compresses and allows the grease liquid, (once it separates), to leak out and to get all over the place.
If you do decide to take your mixer apart you might try to just tighten up the screws that hold the two pieces together and try the re-mix process, that solution works on about 20% of all mixers I have repaired. Do this if you don't want to spend the 20 bucks on parts and grease. Let us know if this helped.
There should be a small lever on the base in front of and below the bowl. It will move to 2 positions. It sounds like you have it set for the small bowl but are using the large bowl. Press down on the lever and move it to the other side. If I'm right, that should correct the problem.
There is the possibility that if the mixer is 30 years old and it has never been serviced that the gasket around the gear case is leaking oil and in that case it would not be hard to get liquids on the armature or the stator as the gear grease in the transmission is vegetable base grease and it separates into liquids and solid and when the head is tilted up the failed gasket allows the separated oil to leak down and to the rear onto the mixer right onto the motor parts. It maybe nothing more that cleaning out all the old grease and re-packing and adding a new gasket.
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