It certainly is a bad design, the cap is difficult to get off, I use a screwdriver which yes eventually breaks the edges, inside the cover were two rubber seal rings, I took one out to enable easier removal, the rubber pipe that it sits on coils down around the front of the engine and is strengthened in part, this takes the oil directly to the sump, and is clipped there, it is not a difficult pipe to replace, because of its shape these pipes eventually split resulting in the ingoing oil now outgoing onto the road. Colin