Manual Motor Workshop 2.5 TDI V6 Vag

Hello, I'm new to the forum. I'm from Asturias, and for the last 300 km or so, my 1999 Passat TDI V6 has been leaking oil when it's stopped and hot. As soon as it cools down, the leak stops. I get about four drops, right on the left side of the oil pan, but I can't see where it's coming from. It's a mess. I think it might be coming from a seal, but I'd also like to have the manual for my engine to take a look and learn a bit about the parts. If anyone has any suggestions, thank you very much. P.S. As you can see, I'm not very familiar with these forums, so please excuse me. Regards.