The 2004 owners manual diesel supplement INFERS that oil changes could be as infrequent as every 10,000 miles, or more if the "life system" doesn't indicate a need.
This seems high for a hard working engine, but this is my first diesel....
Other forum threads suggest as frequently as 4,000 miles, and doubly confusing some guys change oil+filter at 8,000 with a filter-only change at 4,000.
Seems backwards to me; if you were going to do one thing only, surely the oil twice as often as the filter, no?
thoughts welcome and appreciated, thx.