You should contact the manufacturers (ie Castrol, Texaco, Esso) in Norway, ask them for their overseas dealers/depots, and see if there they:
have what you need generally in stock
can get it for you
Your second option is to contact the British embassy in the country where you want to do your change. They use Discoverys, and now probably are using TD5. Ask them if you can buy some oil off them - always worth an email...(they might even give it to you for free in exchange for a  and some good stories)
Sam.
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