Could this be the type of gas i am using or the oil not the right type ?
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2000 Jaguar S-Type Question: Valve knocking
Answer #1patrick mannion from Greg Solow's Engine Room, January 18, 2010, 23:31Master
Get this properly checked out preferably by someone with Jaguar experience. This engine had problems with timing chain tensioners if left neglected results in expensive damage. Pinging could be caused by poor quality gas but the engine has knock sensor/ignition control. Is the Check Engine Light on?