Adventure? or Trouble?

Chris is in Africa. He left on Dec. 28 with Lelia to London. They will meet with Frank in London, then Lelia will travel alone to Africa then meet Chris and Frank in Kigali.
Zach left on Dec. 28th to go back to D.C via Dallas . He called me from Dallas and told me that he is having trouble with the car. I tried to persuade him not to drive the old car during this time of the year. Zach insisted, and Chris encouraged. It is so hard to understand him and Chris. They think this is an adventure. To me it is a trouble. I wouldn't mind having an adventure, but I want to avoid troubles. How do you distingush an adventure from a trouble? It is time to let him go. Zach is an adult, and he can take care of himself. I did my best to help him not getting into trouble. Fixing the car, which cost me $1000, and helping him with gas. It is now out of my hand, I need to let him be an adult. I am trying very hard to distance from his adventure. Now it is his adventure that he needs to experience the consequences.