Just changed the oil in my auto-box .As it had done 127k on original oil Ithought it best to do
Took a short trip in the car to warm the box up and then drained the old black oil into a container - yep - it came out nearly black
Removed the sump and removed old filter and gasket and fitted new (£66 off Ebay).Cleaned/wiped sump and magnet - hardly anything so I think i've caught the box intime
Refitted the sump and then measured what came out - just over 6 1/2 litres.
Got my garden pressurised weed killer spray unit and cleaned out thoroughly and dried.Commenced to fill it with 6 1/2 litres of fresh oil - pressurised and then commenced filling
When 3 litres had gone in it started to flow out of the filler hole so I started the engine and cycled through the gears before finally leaving it in neutral with the engine running.It then took the remaining 3 1/2 litres and at the very last drop started to trickle out of the filler hole - plug refitted and job done - time= @1 hour :
I purchased my oil from Watsons as suggested by another forum member and as it's 20 litres will drop the oil after 3k and refill again - just to be sure

Thanks dude gonna do mine soon. Do you think it needed a filter? Someone said these are more a strainer for big bits?? My Previous RR's!
2018 P400e Autobiography
2008 TDV8 Vogue
2006 TD6 Vogue
2007 TDV8 Vogue
2007 RRS (I know, it doesn't count!)
2005 4.4 Vogue on LPG
2005 TD6 Vogue
2003 4.4 Vogue
2001 4.6 HSE
2000 2.5 DHSE
1999 4.6 HSE
1997 4.6 HSE on LPG
1995 2.5 DSE
1989 3.9 EFI classic
1988 3.5 EFI classic

Yes - I read the comments and based it upon my reasoning that if there's particles etc suspended in the fluid there would be some in the filter - the last thing I want is new fluid washing/picking up old 'bits' from the filter.
Anyway .... been out for a 30 miles test ride and even though it was smooth before - its even smoother now
Maybe my box has lasted longer as it's never towed anything There is no towbar frame fitted to the car to attatch a towbar to so pretty concusive on that score