i joined this site for this very same problem (or question) my wifes 2006 v6 coupe AT started making this sound about 4k miles ago. its very faint until you hit the accelorator and then it "sounds" like your car has some serious winter tires on it however when you lay off the accelorator the sound goes away reguardless of your speed. btw we are running 5w20 conventional and recently did a coolant flush @ 28k miles. anyone have any insight into this???
