I believe some of our Aussie posters have posted their oil preferences for the diesel six. Suggest a search for 'diesel' and perhaps the LL01 or other engine oil criteria [brand names, castrol for example?] if you can't locate an owners' manual.

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2006 X5 3.0 6-spd w/Evo UUC ssk
sport/premium pkgs
born Valentine's Day, 2006.