Ask these questions.

#1 The service you are performing is under warranty correct?

#2 If the car needs to have a coolant flush, and a fuel injector flush are these items covered under warranty? If so where in the warranty schedule are they located?

#3 If you are suggesting these items because BMW requires this service then why are you trying to charge for something that is covered under warranty.

#4 If you are suggesting that these items need to be done before the scheduled maintaince are they not covered anyway.

#5 If you are suggesting these items and they are not on the warranty schedule then what's your motivation?

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….