Another way is buy the cheapest car, add the most expensive wheels and tires at max size and width, it will add massive value to the car, far more than you spent on the wheels.

Played these games for years and this is by far the best method I have found, but doesn't seem to be that well known.

Always here to help

Thanks for the guide HTF and thanks for the tip Goofy

or you can start a new game with a profile name cms2021promo and get 500000 cr and all the skill points you need, and then renovating cars and earn 40000+ cr for sold car :-D