I know this is an old thread so here is a more recent update on what's been recommended above. A year ago I purchased a beautiful 2008 2.2d estate with FSH and 2 previous owners, only 67'000m on the clock. I have filled up with Shell V-Power only with the addition of the Millers Eco Boost and the Castrol 2-stroke oil.
It runs quietly, smoothly and no smoke whatsoever!!! I have no comparison unfortunately as I've done this since I purchased it but I'll continue to carry on this routine. ECU remap from CT is next on the agenda later this year!!
I'm loving my first Jaguar, all my future cars will now be Jaaag's, I just wish I had bought one earlier.
Mark