Vehicle Extras Repairing on change

Ive been looking around for a few hours and cant seem to find any premade scripts or guides on how to make your car stop repairing on extra change. Im currently using extra menu ( I know its possible because the old city I used to play on had it working to where it wont repair and they have the same extra menu. Honestly I would be fine settling down to even like a spot where you have to pull up and do it in a location. Primarily need it for PD so they can adjust the cars and see it change in their eyes. But I dont need the Civs abusing the fact that they can abuse the repair. Because then that would break the loop for towing and mechs.