What the developers should do in my perspective is to make away that you could make your engines explode if your red lining to hard or if you rev your engine too much maybe you could make a way that if you damage your engine too much and crash oil or some type of liquid will leak from the bottom of the car those are my suggestions of the game
We had that topic so often but for your temperature thing there is a mod for it. Stichinsteins mod collection or so. The oil and stuff is difficult in this engine and would cause massive performance problem