My experience with the D2 would suggest that you will need more than 7 litres as some of the new is lost flushing out the old.
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2019 BMW M5 (my daily driver)
2002 Mark's D2 S8 FE
2020 BMW M340d xDrive (Anely's daily driver)
2000 FL D2 4.2 QS - SOLD 2011
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