Hello,
When the car sits on the lot they lower the air pressure in the tires to make it have a smooth ride, then when they get it ready for purchase they refill the tires to proper air inflation which makes the ride a little more bumpy. The STS is a sport suspension setup which is also a little more ridged that other Cadillac's.
Please use 2CarPros anytime, we are here to help and tell a friend.
Best, Ken
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Friday, March 24th, 2017 AT 1:33 PM