S range of coolants and antifreeze solves this problem as each formula is designed to protect your engineâ??. s components throughout the year, allowing your engine to run smoothly. Containing Ethylene Glycol, Xstream G40 antifreeze and coolant concentrate is silicate based, giving protection from -36°C to +45°C. Suitable for both petrol and diesel engines, it protects against corrosion, erosion, overheating and freezing.