That GC had Moly added to it. Did you change the oil or have it done ? Thats an appropriate level for GTX added to this mix.
Unless the Hyundai moly coated rings are coming apart from the fuel! I do not see that taking place.
BTW, No fuel injected engine should have that level of fuel dilute, hope you corrected. Does not matter how much it idles or if it is cold weather ops.