Castrol Magnatec Diesel for my 05 CRD.
I didn't think a fully syn was worth it since my motor's done 145K and I change oil and filter within every 10,000. (and check everything every 5000 or so)
Have also used Valvoline Durablend and Penrite Diesel. Both are good too.
I think a 5000km oil and filter change interval is a bit too conservative though, esp since the decent oils are semi syn already.
I dare say that those who change oil every 5000km and have experienced better reliability are reaping the results of 'giving the engine a once-over' every 5000km and it's not so much the oil that is providing the extra benefit.
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