Blown head gasket

[XandeR]

Drove my '18 back from a weekend trip and noticed the temp gauge creeping higher than usual and no warning lights, but it slowly got worse over the week, the idle got rougher, white exhaust, and a coolant reservoir that's now begging for mercy, went to the dealership anyway band they confirmed my suspicion, its a blown gasket
What gets me is this vehicle hasn't even seen abuse, just highway miles, routine maintenance, no overheating history until now. I get that it's a big engine under a lot of weight, but I didn't expect head gasket failure this soon

 

[RedArmor]

Head gasket issues aren't too common with these cars, but little things like minor coolant leaks or a stuck thermostat can lead to problems. Did the dealer figure out what might be causing it, like a faulty water pump or thermostat?