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Hi,

Could you advise what would be the expect life of an Jaguar 2007 XK engine before it would need to be refurbished or rebuilt.

Many thanks

With good service an engine can last for a very long time these days before the need of a rebuild.
Typically the usual reason for a rebuild is excessive oil consumption or smoking and reduced performance, If you are concerned with the health of your engine a compression test and blow by test may help to determine if a rebuild is necessary