Please check the audio clip for the noise coming from the engine. Which is louder towards the end when the engine falls back to low rev after gas pedal is pressed.
I checked the oil and it looks good and clean and not due for a change in an another 1.5K miles. No check engine light on or any other obvious symptoms.
2010 RX 350. 68K Miles.

Thanks for your help

 

I listened and could not identify what the possible source could be of that engine noise. It does sound a bit like engine rattle, but it could be any number of different things
I think your best way to diagnose it is to have it inspected by a highly rated independent Toyota or Japanese car specialist repair shop. Do not go to a dealer. They need to listen to the engine with a stethoscope to isloate the noise source among other possible diagnostic methods such as checking for stored codes. With your very low mileage I am interested to know what they find is the source
Good luck.

 

thanks will update when I find out more