I am sorry to hear you are having problems with your mixer. To stop the oil leaking from the front of the mixer, you just need to remove the drip ring and give it a good clean underneath and this should stop the oil from leaking out. Below I have added a link and if you watch on the timing "1.28" you will see how to remove the drip ring.
I am sorry to hear you are having problems with your mixer.
The first place I would start is to look at your Motor Brushes, they may have been placed in incorrectly or have worn down too much. I have added a link below for our help video on checking and replacing the motor brushes:
I called KitchenAid about this issue with my mixer. The agent on the phone told me they are aware that it tends to happen to some mixers after they sit for some time. Basically, a "lifetime" of grease has been packed into the assembly and it is normal for it to release grease on occasion. I was told to run the mixer at 10 for at least 2 minutes to get it going and I should see a reduction in the oil leak. I had about a tablespoon worth of oil dripping down off the assembly. I was told that if over time it seemed to amount to about 1/4 cup then I should call to see about repairs due to a potentially bad seal. I was also told that the repair for that would most likely NOT cost the same as a new appliance.
Among the causes for the mixer not turning on are (in no particular order) --
The leaf-spring switch on the Control Plate is not making contact.
The Phase Board is defective.
Brushes need replacement.
Brush chamfered side not correctly oriented.
Bad armature or field coil.
Seized motor bearing.
Detached or broken Control Board spring.
Speed Control Link plastic end broken.
You will find that the fuse gear has failed, it's either been overloaded or it's just worn out from use or maybe the lubricating grease has gone old and needs changing. That will be change the failed gear and replace the grease.
Kitchen Aid is 100% correct. The cause of the problem is age and lack of regular use, the oils in the gearbox grease separate from the solids over time and the oil then leaks out at the planetary and sometimes where the 2 case halves join under the silver trim band.
If you are up for a small job knock the chrome trim ring around the planetary off and clean it out and wipe around the area it covers. It is called a drip ring for good reason, you may find it full of oil.
The grease Kitchen Aid used in their mixers is Food Grade and it's harmless.
More likely the pedestal base is bent. Your local service agent has probably seen it before and should be able to bend it back flat again. It's a brutal process with a heavy soft hammer that you probably won't want to see.
There are several things that regulate the speed, we will assume that the adjustment has not been messed about with. If the governor on the motor armature that presses against the underside of the square black speed control plate at the back has not flown apart then I would replace the small pcb (phase board) on the top under the back cover. One screw and 4 wires hold it on.
The head bounce sounds as if the locking hook is not engaged properly when you slide the head-lock lever to the locked position.
If this is the case, you will need to disassemble the mixer to make sure the link from the lever to hook is not bent. Another possibility is that the slot in the base the hook engages. If this is broken away, the hook will not be able to hold the head in place (I sure hope that this is not the problem).
Just recheck that you really have put the brushes back in the right way, use a torch and look in the hole. The brushes can each go in 4 ways, only one of which will work. Look for the blocker and line it up with the cut off corner on the brush. It's normally at the back, one side at the top the other at the bottom. After that you need to be looking at everything you have done for a booboo. I doubt it will be water ingress. Make sure the switch contacts come together when the lever moves to position 1.