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On my N54 I had to add a 1 litre of oil before I got to the oil change intervals for my first 2 oil changes. After that the engine didn't use up as much oil. My N55 has 7500kms on it and I would guess by my oil level I will need to add a litre before I will get to my oil change interval for sure.
Follow the idrive computer! When it beeps and says "add oil" then you add 1 bottle of oil. BMW has always put a spare one in my trunk. After every free oil change the dealer replaces the spare oil every time. It is very easy. No guessing about do I add half a bottle...3/4 a bottle. Just wait till it tells you to add add oil and add the whole bottle as per the owners manual.
A mechanic friend of mine said he sees more issues with people OVERFILLING oil these days. As he told me...if the engineers have it set up to "beep" when it needs a full bottle then that is perfect. No problems with over or under filling.
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