I would drop that oil splash pan, and if dirty, or oily, clean it up nice and spiffy.

Don't forget to look up at the underside of the engine with the pan dropped, and check for oil and residue. And clean that up also, if necessary.

Put the pan back and run the car under normal conditions for a while.

You now have a clean reference point to go back in at a later date and visually inspect.

I know that when my Valve covers were leaking oil, I never noticed an oil drop via the dip stick, or oil on my garage floor.

But when I dropped the pan, oil was caked onto the inside of the pan, and I could see oil on the underside of the engine.

Get under that car, clean it up if necessary, and start from a clean reference point.

That's what I would do before changing anything...

BTW...Just noticed your Bklyn location...I'm in Queens, so we're almost neighbors...we should hook up sometime in the near future...and compare rides...