buy an ispection mirror
brake clean the area
blow it off dry
wrap a dry rag around the oilpresure sender and line if there is one
start it for a minute and shut it off
take the inspection mirror and see where the leak is. remove the rag and check it for any oil leakage
oil sender or line is a common one
use the mirror to look for a void in the silicone sealer or the rubber seal that has been spit out of place
https://www.mactools.ca/products/mhtk2
you may find an illuminated one if you dig deeper, the link is just for reference