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Thank you Josh for this quality answer. It seems that starting with DirectX x64 solved the issue with CTD after changing the buffer to 20. Also, increasing the buffer solved (until now) the issue with invisible cars.

One more question before we can close this topic, how can I set up ETS 2 to start automatically with DirectX x64?

on Steam, you can go to settings and there on Start options you can add: -64bit

@blue_star, The game will "remember" what option you selected to start your game the previous time, so just right-clicking on your game title in the Steam Games page and selecting "Launch with DirectX (64-bit)" will always launch the game in 64-bit mode using DirectX from then on, until you launch the game using a different option in Steam. As BebeMischa said, you can also force the game to always use 64-bit mode by adding the "-64bit" option to your game's Launch Options. You can also add option "-rdevice dx9" to the Launch Options list to force DirectX rendering. For example: Alternatively, you can set the rendering mode in your game's "config.cfg" file (in your game's home directory, typically something like "C:\Users\[your windows username]\Documents\Euro Truck Simulator 2"). The line for the "r_device" variable controls it. To use DirectX rendering set the line to: To use OpenGL rendering set the line to:

Thank you guys!