Oil leak help!

[bmonsour]

I have a 2002 s40 1.9L with ~160k miles on it, mostly highway miles, regular oil changes (but not the best quality oil). I noticed an oil leak at the bottom aspect on the back left side of the engine (if you are facing the open hood). I changed my oil around 3k miles ago and my dip stick still shows a normal level. I'm guessing this is probably a leaking or damaged seal? Has anyone tried Auto Rx or any other type of engine cleaner?

Also I've never cleaned/changed the flame trap/pcv valve and was wondering how I locate this and test to see if this is clogged?

Thank you for the help!