I believe that it would be a huge aspect to the server if there was a Mechanic school type system implemented somewhere in LS.
It would be great for people to start side businesses fixing other people's cars.
Although while implementing this, I think this system should tell you what is wrong with the car.
Maybe using a command such as /inspectcar - Then it showing what the issues is with the vehicle;
Then knowing the knowledge from the school, you can go to the Auto Parts store and get the parts needed.
Once you have the parts, you should be able to /repairvehicle, if it's just yours without charge, but you should have access to /mechoffer so that you get labor added on.
I feel like this could bring much roleplay around.