Gearbox Fluid change (8 speed ZF)

[tonycordon]

I know that the gearbox of my '13 XF Sportbrake is 'sealed for life', but I am hearing opinions saying that a fluid change, which involves a new sump pan and filter is beneficial and that the difference can be 'felt' whilst driving. My car has covered almost 90K miles, I have owned it for 7 years and intend to keep it for as long as I can. So, does anyone have any relevant experience?