Thanks Silkhammer, that's the exact precise info I was looking for.
From further research, any oil used must meet spec WSS-M2C934/B or ACEA:C2.
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No problems, have just gone through the same process myself!
Based on my experience, try to find a Castrol "distributor" not just a "stockist". $ might be better.
If you look on the Valvoline net lube site you will see the D4 MY2014 uses Synpower C1 5w/30 full synthetic.
Same oil as the Puma 2.4.completely different to the D4 2.7 which uses Synpower FE,as do most late model ford engines,including the 2.2l Puma,(but not the 3l D4).
I picked up 20l(smallest size available) of Synpower C1 5w/30 for the Puma for $220 on our account at autobarn,Supercheap wanted $325.
MR auto use Valvoline oils in all the LR's they service.
But i recon for top ups you are better using the same oil that is in the vehicle,mixing oils should be avoided if possible.
In 15yrs of owning LR's,i have never had to top one up.