I Have a 2016 Ecodiesel the air suspension worked great no problems for first two winter's. I live in Central Canada and can get very cold -30 c sometimes. Last month drove on hwy for 3 hrs -30 c temps. The next day getting the service suspension , it was down in front. The fuse was ok but truck was down in front. Dealership says they can recharge with nitrogen and add airline antifreeze. For $650. I was told when purchased new it was nitrogen filled. I parked it heated garage for 24 hrs and all was working fine. But soon as it got cold i got the message again. did some research this air system is NOT a close loop system. Traced two air lines that goes up behind the passenger tailight, that is where there is a intake and outtake lines the intake has a filter mounted to it. So I think over the years it has inhaled some moist air into system. The cannister comes part and I put some airline antifreeze containing lubricant, about a fluid ounce just enough to saturate the filter. Then I ran the suspension a few times for a few days, it has been a few weeks been good and been cold and has worked properly. The intake line goes to the distribution block and then introduces the antifreeze into the air system. This may be another annual maintenance job now, so far so good. Just sharing some info