Just checked the fluid levels in both diffs and front took 0.3l and the back took about 0.5 l to fill them neither of them has a leak anywhere so either they haven't been filled correctly in the past or the oil has disappeared , so a question for the experts , is it normal for the fluid level to drop over time with no visible leaks ? Cheers .

The diffs take a set quantity of oil, and it seems that this is not enough to make it come out of the holes. Basically there is nowhere for the fluid to go or get used up.

To refresh the oil you drain it down and put in a set amount as given in the workshop manual👍 There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
Fiat 500x 1.4 multiair Lounge 2015
2010 LR D4 Commercial 2.7 TDV6

Thought it couldn't go anywhere, but thought like most boxes the oil should trickle out the fill plug, I'll drop the fluids and refill them with the right amount after Xmas . Thanks for that

See here for quantities

http://www.fullfatrr.com/wiki/Recommended_Lubricants

Listing for the td6 shows tyk50070 for the rears, but afaik this is the fluid for the locking rear diff (Castrol carbon) but the rest of the listing is the same spec as the front tyk500010 There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
Fiat 500x 1.4 multiair Lounge 2015
2010 LR D4 Commercial 2.7 TDV6

The 3.6TDV8 isn't specifically listed. Is it the same as the 3.0L? 2012 5.0L S/C
Previous:
3.6 TDV8
4.4 HSE
P38 4.6 HSE
Classic 3.9
90 County
Series3 Lightweight

Tdv8 quantities on this thread.

http://www.fullfatrr.com/forum/topic29158.html There is nothing that can't be fixed with a hammer😜😜
FFRR 4.4 SDV8 Autobiography Santorini Black.
Fiat 500x 1.4 multiair Lounge 2015
2010 LR D4 Commercial 2.7 TDV6

Thanks! That link is for the rear diff - quantity similar to the 3.0L. Can we assume 3.6L is also similar to the 3.0L for the front? 2012 5.0L S/C
Previous:
3.6 TDV8
4.4 HSE
P38 4.6 HSE
Classic 3.9
90 County
Series3 Lightweight

Front diff on tdv8 From rave: 0.75L refill 0.8L from dry. Castrol SAF XO - 75w/90 so same as td6.

 2012 5.0L S/C
Previous:
3.6 TDV8
4.4 HSE
P38 4.6 HSE
Classic 3.9
90 County
Series3 Lightweight