Very faint engine ticking flickering sound during accleration

[landarcht]

Curious if anyone has had this similar sound. My 2013 has had it since I got it as a second owner almost three years ago. I can hear a very faint ticking/flickering (like fan blades hitting something as it pins) sound each time I accelerate, it is nearly not noticeable at highway speeds or if you're not paying attention, so it near whisper but I could hear it along with the normal engine sound. No issue with the car, engine is smooth running as always.

 

[TinsleyC]

Could it be early detonation, or engine ping? Try a couple tanks of premium and see if it goes away. It may not be, as it's usually heard on the highway at heavy load.