What antifreeze is best to use in a jaguar 2005 XK8?

For a 2005 Jaguar XK8, it's recommended to use an ethylene glycol-based antifreeze that meets the Jaguar specification, typically Jaguar's own coolant or an equivalent that is phosphate-free and meets the ASTM D3306 standard. Always ensure the antifreeze is mixed with distilled water in the appropriate ratio, usually 50:50, for optimal performance. It's best to consult the owner's manual or a Jaguar dealer for specific product recommendations.