My 2014 equinox made the same type of noise when the dealer put in dino oil and my mom wanted to wait till the OCI dropped to 0%. I changed the oil and started putting in mobil 1 and it hasn't made the noise since. Not sure if it could be the same thing
It sounds like a sympathetic vibration to me. There was a known problem with lines attached to the firewall that would vibrate under certain circumstances. I'd like to hear what it sounds like in the engine compartment.