Great link to the flushing process, and nice tip on the 1/2" socket. I reviewed the WIS+ASRA literature and the flushing process is very similar - remove one of the cooler lines and flush out 3 liters, then top up and repeat. The literature notes that a total of 15 liters of fluid will be required.

I picked up the parts from the dealer including the dipstick tool, plug, and magnet. I'll update the board with the quantity of fluid used.

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89 300te 222,222
92 300e 190,000