Hello all,

The car has 83k miles and started making a rattling noise between 2500-3000 rpm. In the video you can hear the noise at the 5 and 10 second mark: https://youtu.be/fONtco4me0c

I did some research prior and thought maybe it was an exhaust leak, so I thought a seafoaming would help detect that, but no luck. Next thing is perhaps a valve adjustment?

The car has a new o2 sensor, oil flush and change, new plugs and clean air filter

Any help would be appreciated !

Thanks in advance!