How to Add Coolant: Jaguar XJ8 (2004-2009) - 2008 Jaguar Click to view0:33Adding engine coolant (also known as antifreeze) to your 2008 Jaguar XJ8 is pretty easy. Engine coolant circulates through your engine to keep it cool in the summer but won't freeze in the winter. Make sure to check your engine when it is cold for an accurate reading. Jaguar XJ8: A light came on saying Engine Coolant Low. I Jaguar XJ8: "Low Coolant message on my 98 XJ8 came on today. "Low Coolant' message on my '98 XJ8 came on today. Have never added coolant so I checked the manual and saw that Dow D542 (yellow) coolant is required.