240 D leaks oil

Hello guys, for a few days, oil drips from my 240 D. I checked all this time, and for me it looks like the oil tank seal is through. The oil seems to be mainly on the screws on the seal (back area). From above apparently no oil comes from anywhere. Have cleaned the place once and wanted to check it again in a few days. Has any of you ever had experience with it? Thanks and greetings to the round Willy