I recently purchased my first infiniti, it's an g37xs 2012 in very pristine condition, I am 52 years old and mainly do interstate driving back and forth to work, I have noticed this car has Hotchkiss front and rear sway bars, and a strut Tower brace. Previous owner just replaced lower control arms with bushings. I put brand new Bridgestone all season potenza 980 as tires on the car, had alignment checked, and nothing can be found wrong. The car is all over the interstate at 70 miles an hour, and with a cross wind it's way worse, the car has been inspected front to back by a reputable suspension shop and nothing can be found. Could it be the sway bars are off on their settings it is very hypersensitive on the steering. Any help would be greatly appreciated

 

Could be the new tires. Drive it a bit for 500 miles and see if it improves. I’m on my second set of continental dws06+ and initially it is twitchy, and would wonder around a lot more. After a few hundred miles it drives like normal. But, the steering wheel is pretty sensitive on these cars.