99 Civic Oil Leak from engine.

Been noticing oily wet spots from the photo below in area circled by yellow.

https://i.imgur.com/wM7dIrCr.jpg

Have been refilling about a quart every 6-8 weeks.

No other noticeable symptoms. Spark plugs and its areas are dried. Coolant level and temp are normal. Idling is normal, but twice the car sputtered for a few seconds in a red light the past month.

Any inputs? Thanks in advance.