Asked a million times I know, But want to be 100% sure I'm getting the correct oil.

From looking at older threads, It seems to be 75W-90 Fully Synthetic for the Diff. (Standardish car, Not really driven very hard)

I assume this is the stuff,
http://www.opieoils.co.uk/p-850-silk...-5-75w-90.aspx

Now it varies between 1L and a bit over (From various threads) so I will definitely need 2 bottles?
I'll be removing the diff back plate to change it, I'd rather put on a new backing plate seal/gasket... Where can these be got?


What's the recomended oil for the T5 Gearbox?