I've been driving BMW Diesels for a few years, and have had several models including the 118d, 120d, 123d, 318d and now a 325d (E92) 6-cyl 3 litre.
All of them have shown a reasonable amount of oil-burn in the first 1000 miles or so (up to a litre). After that, they burn no more oil in my experience.
What I have also noticed more recently, on the cars fitted with the Professional Computer/Sat-Nav Display system, is that the oil-level there may show FULL, when you go into vehicle settings, but the dipstick shows it's on minimum. The last 325d I had did this. It was on minimum on the dip-stick, so I topped up with around 500ml of LL04 oil. The dipstick came close to maximum (but not over it), but the Computer said it was overfilled, and I should go to a dealer immediately. I did that, but they said it was a common fault.
The two do not match up at all which is very confusing.
Going back to the types of oil used, the Handbook specifies very clearly the Specification. In BMW's case it will either be Longlife01 or Longlife04 and they recommend Castrol Oil.
If you buy a Halfords or other brand, check that the oil meets the LL01/04 specification but a litre top-up kit from a BMW dealer was cheaper than Halfords, and the correct oil 100%.
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