Never had to get to mine on the F1 so unsure, but on the F2 you need a cut-away socket to turn the nut and hold the allen key in place. You just can't get the angle / depth with a spanner.
... and don't over-tighten!!!
Being a 2009, I don't think it'll have DPF (my MY2009 hasn't).
I went with Castrol Magnatec on my last change - I'd rather spend a few quid more on a decent brand.
It needs to meet a Ford standard. I'll try and dig it out...