I'm a lot late here but Epic Games are giving away Car Mechnical Simulator 2018 for free as part of the usual giveaways, you have until the 30th to add the game/claim it
The game is only offered for windows users, those of us on MacOS will have to pick up the steam version which is currently on sale due to Steams massive yearly sale
The game is very well reviewed across it's numerous platforms and like many in this category is good at what it does.