[BMW Atlanta]

Actually if its leaking at the boot and dripping down to the paralever pivot it is most likely the front pinion seal or rear main of the tranny. Pull the boot off from the Final drive and see if there is a trail coming down the swing arm or just oil at the boot which would mean pinion seal. If you are seeing oil slung onto your wheel then it is most likely the big hub seal where the wheel mounts to the final drive as Rapid refered to. The pinion or hub flange seal are both easily fixed if caught in time.