Found this useful website with all the information relating to the types of oil (inc diffs etc), how much and how often for possible all vehicle makes but have highlighted the 80 series page. It is in dutch but google chrome easily sorts that problem!
http://www.mpmoil.nl/index.php?id=produ ... odel=14917
http://www.mpmoil.nl/index.php?id=produ ... odel=14917
