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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.
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.