start at the oil pressure sensor
its the lime green connector on the oil filter neck behind the motor
unplug the connector and look at the terminal end...if it was running recently before you do this you may see a few drops of oil come off it.
these buggers leak internally through the diaphram crimp and will seep pas the wire/connector grommets while the engine is running...its the primary cause of larger volum oil leaks....esp since she's at 162k...most dont last that long
start there.... 35$ easy sensor > replacing OPG and still having a leak lol
btw if you need to replace it, generally you can get it out with a pair of channel locks but i have the special socket for em as well