Thanks for your input!
Here are some pics. What you see is the right side of the block and the oil cooler. I have wiped the plug where it was dripping from. But you can see oil above it so I don't think it's the plug leaking.
The oil pressure sender and oil thermostat is above this point. And since the shroud are covering these areas it is hard to detect any leaks.
Thanks for trying to help me out.
//Jörgen