Quite a bit of oil is not good, looks can be deceiving sometimes, maybe oilier at the bottom not showing in the photo. From what i see in the photo the side cover gasket might have failed, you can try checking the bolts to make sure they are torqued correctly , dont overtorque they will break, i know from expierience, but you could check them to make sure they have not loosened over the years and hope that does it.