Had the message Service Def System see dealer message pop up today while towing my camper home. Message stayed up for about 15-20 minutes then completely went away. Truck is a 2020 2500, 11K miles. I pickup it up Pre-Owned with 6500 miles on it. Since ownership for 1 month I’ve added 5 gallons of Platinum Blue Def and just did an oil change last week. Def tank is about 1/2 full. I’m still very new to diesel trucks and the def system and my question is should i be concerned or just press on and drive the truck as normal? The truck did not throw a check engine light and never ran funny or anything, temp was maybe 40 degrees outside.