Just open up a banjo bolt on the rack and let it drain out. I've drained my E90 3 times via one of the banjo bolts and haven't even replaced any of the crush washers. No need to be afraid of opening up the system. Not sure why some BMW owners are so OCD. It's just a car with standard parts. There's no magic in it.
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A manual transmission can be set to "comfort", "sport", and "track" modes simply by the technique and speed at which you shift it; it doesn't need "modes", modes are for manumatics that try to behave like a real 3-pedal manual transmission. If you can money-shift it, it's a manual transmission. "Yeah, but NO ONE puts an automatic trans shift knob on a manual transmission."
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