Where is this valve??? I added seafoam and it cleared 90% of the chatter up. I'm really stoked about it lol

But this valve. Is it in the same assembly the oil coolers are part of? And after replacing all the gaskets, I still weep oil. Could this valve be giving me the 1 or 2 drips/night?

 

The oil cooler and filter attach to an alloy housing, which is bolted to the block, and houses the oil pressure switch, turbo oil feed and oil temp sensor.

If you remove this housing from the block, in the back of it is a 1 way valve thats screwed in, that stops oil flowing back to the sump when the engines shut off. I've seen the valve work loose before, resulting in the oil draining back and a loud death rattle for a second or two on engine start.