Is there a specific or recommended power steering fluid for the XJ8 (2006) also also I read this car will last 150,000 to 200,000 miles is this true?

 

Mercon III is the spec, but you can use V or VI as well. As long as it's Mercon. Don't use the generic crap or "Suitable for Mercon" fluids, just plain Mercon.

As far as longevity - depends on service history. If the car was serviced properly, yes - if not and you get things spec'd back up - probably.

Biggest concern with the drive train is the trans. Jaguar touted the trans as "sealed for life" - thats BS so, if you have no service history backing up a fluid/filter change and the car is over 50K miles start there.

You can use Mercon SP or the original LG6 fluid, get a legit ZF filter pan and also have the mechatronic sleeve swapped out.

Lots of YouTube videos on this.

Also, take it to a Trans shop specializing in Euro cars.