A lot of tubos allow oil to pass the bearing seals. I think after a few miles some weepage is inevitable and this ends up outside as you can see, Its not ideal but if the car drives OK and you are not getting smoke leave it well alone.. Youn coukd use a little engine cleaner and a rag to make it look better. There are no user serviceable items in there. You can fit an oil catch can into the system if it develops but at the moment there would be no benefit to doing anything and it will probably do many more miles. Just change the oil regularly and use a fully synthetic oil.