Original sentence: If an engine metal is at 300 °C and the air is at 0°C, then there is a 300°C temperature difference for cooling.In contrast, a liquid-cooled engine might dump heat from the engine to a liquid, heating the liquid to 150°C which is then cooled with 0°C air
Edited sentence: If engine metal is at 250 °C and the air is at 20°C, then there is a 230°C temperature difference for cooling.In contrast, a liquid-cooled engine might dump heat from the engine to a liquid, heating the liquid to 135°C (Water's standard boiling point of 100°C can be exceeded as the cooling system is both pressurised, and uses a mixture with antifreeze) which is then cooled with 20°C air