Interesting!
Was so long ago I've no idea what the Jag specialist recommended for the break-in
oil for the first 500kms.
But the diff has been filled almost all this time through rebuild - well at least since March 2009 according to my spreadsheets.
But I held onto the empty
oil container he gave me and which is an
AMSOIL series 2000 product he suggested be used after diff break-in.
The specialist said to use this from 500km until the next diff
oil change at 10,000km!
Its a 75W-40
synthetic but doesn't suggest it contains any additives and is recommended for GL-5 or MT-1 specified applications plus others.
Given the guy worked on Jags as his stock in trade I'll stick to the recommendation unless someone can demonstrate a compelling reason otherwise.