Engine Knocking

[Tchyk]

Worried. Over the last few weeks the engine on my 986 S, Tiptronic 37k miles, has been making a soft knocking sound that is coming from the driver side. It is very intermittent, and only after the car has warmed up. Becomes audible below 20mph and gets louder the slower you go. in park you still hear it, clearly coming from the driver side.

Although it has been quite intermittent I was lucky enough to get it to my mechanic while it was happening. His conclusion was perhaps a valve seat, or something else that would require teardown to identify. Oil filter was clean, and no other problems showing themselves at the moment.

I turn to the community, anyone have any thoughts?

Any feedback is appreciated.