I like new heat gauge and oil gauge but it seem to be visual beauty only.. it would be good to implant in hardcore mode some consequence of damages which would be visible with those gauges.
-When damage is high, the temperature level will increase constantly, the speed will depend on the level of damage, so it would be necessary to stop the engine to cool it. Pass into the water would also have a cooler effect and why not at very high temperature the water would be rather harmful.
-For the oil levels, the lower it is, the more it increases the fuel consumption.

Agreed. And take it a bit further. Have something similar to damage modules on sim racing games. Each component of the vehicle has its own damage level. Suspension, transmission, engine, steering etc.