Hello, I haven’t been in touch for a long time, the opel has been running quite well until now.But when I saw on the garage floor this morning, there was a little oil stain.When I looked more closely this afternoon, a few oil drops were hanging down at the gearbox,ok I thought maybe I could be the wave sealing ring.But luckily,I still saw that the motoblock was a bit oily at the bottom of the gear flange,so the bonnet was on and looking,after a few minutes I ended something of which I ned w ips what it is, and what it does have.And that is… if you are standing in front of the car, then there is a small box on the back right side of the valve cover, which is connected to a hose on the valve cover,and down there comes a hose out of the other side of the engine, but couldn’t keep track of it because the exhaust manifold was in the way,and this part is oiled and also the hose that goes down is full of oil.I guess it went down from there.now my question. what kind of a box, what does it do, can oil run out there, or are only the hoses porous.has the problem had one time and can tell me if and how to fix it? thank you already for your answers