Few engine types have demonstrated such ubiquity and longevity: Jaguar used the Twin OHC "XK Engine", as it came to be known, in the Jaguar XJ6 saloon from 1969 through 1992, and employed in a J60 variant as the power plant in such diverse vehicles as the British Army's Combat Vehicle Reconnaissance (Tracked) family of vehicles, as well as the Fox armoured reconnaissance vehicle, the Ferret Scout Car, and the Stonefield four-wheel-drive all-terrain lorry. Properly maintained, the standard production XK Engine would achieve 200,000 miles of useful life.