find the car you want (RinoPiccolo), and make a copy of Bod圜onfig.txt and Config.txt, name them Bod圜onfig(n).txt and Config(n).txt (where n is one more than a filename that already exists. but if you find the folder in the game data that contains the car you are interested in (in my case the folder is F:\Games\Steam\SteamApps\common\Car Mechanic Simulator 2018\cms2018_Data\StreamingAssets\Cars because steam is installed on drive F: in a Games folder), you will find. so the engine swap option is very useful, but allows you to install only those engines available in the car (if I understand correctly).
You might be surprised what you can do in the game editor.