Any synthetic 15W50 diesel rated oil will be fine, unless it has been run with non-detergent oil..... Brand isn't important so long as it is synthetic (and not one of those semisynthetic blends -- treat those like dino oil).

You can also use any good rated (CH-4 or later) dino oil with reduced change interval (3000 miles or so).

If you do change to synthetic and it has been run on dino oil, change the filter after 1000 miles, it will be full already, then again at 3000 just to make sure it ain't full again!

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!