Hello, Thank you for contacting OnePlus Customer Support. I am Kris and I will be assisting your ticket. I understand how important it is for the OnePlus 6 to be compatible with your wall car charger. As for your concern, yes, the OnePlus 6 will work your wall car charger. Feel free to purchase our OnePlus 6 anytime.
Please let me know if you have other concern.
Sincerely,Kris OnePlus Customer Support