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I completed this job best I could over the weekend but we're going to need more information moving forward. I was able to remove the lower radiator hose to drain the coolant however I only got 5 liters out and the F10 535 holds 10 liters.
In order to remove the hose I needed to loosen the clamp and the torx screw pictured. (I believe it's a T6) After that I was able to remove the hose and drain the coolant.
I filled it back with BMW coolant and distilled water. 50/50 mix. I then used the coolant bleed procedure for the E90s. Again this method will only remove half of the coolant in the system but it's a start for now. If anyone else learns any new methods, please do share.
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