2004 G35x Sedan... Hello helpers... It's freakin' cold here in Wisconsin, but recently noticed my G35x experiencing a humming noise from the front of the car while driving... sounds like it's coming from the engine. It doesn't make this harmonic humming noise until I reach around 30 - 40 mph. If I slow down it will go away and engine sounds normal. Bad bearing? Low on oil? Bad suspension. No shimming in steering. Any ideas?

 

Your description sounds like a bad wheel bearing.

 

This^^^