What causes thick green oil in the front wheel housing of a 1992 Toyota Camry?

Answer 1

My guess is the thick green oil you see is actually the CVU joint greased that has been thrown around the wheel well as the result of a torn CVU joint boot. Try looking at the back side of the wheel in the center you will see a shaft going into the center from the back and a rubber boot that resembles a tapered slinky,(best way I can describe it to you). This boot is probably torn or broken in two completely. Take it to a shop as the boots are quite a job if you do not know how to replace them. If you drive it too long the CVU joint will be damaged and you will have to replace it as well, sometimes very expensive depending on the make and model of the car.