My KitchenAid stand mixer is 9 years and I use it at least 2-3 times a week. This time I used the mixer to beat my egg whites for macarons. As I always do after every single use, I was giving my mixer a quick wipe down while cleaning up. That's when I noticed that my mixer had some brown ooze seeping out from the silver collar above the stem that holds the attachments. Sorry if I'm not accurately describing the parts of the mixer correctly. Here's a photo to show where I saw the ooze. I wiped off most of the ooze but you can still some in the photo.
I have no idea what this ooze is or from where it came. Could it be some kind of motor grease since I had the mixer on for a while? I beat my egg whites on speed 7 for about 5 minutes, but I always do that when beating egg whites for macarons and I have never had ooze come out before. Any clues as to what the ooze is?