So....
Thanks for the help! Finally got around to doing this job...
New gearbox cooler, enough oil (1L container, but only needs about 100mls) to fill the new cooler to the same level as the old one once removed, thermostat plus the disconnect tool to disconnect the lines and a new cooling manifold to hose adaptor.
The new cooler flowed brilliantly using a hose, the old one was just a trickle! The thermostat was also mostly blocked, where you can see the thin silver pin was just a huge lump of build up... So that was also blocked.
Thanks to the suggestion of using the BMW removal tool for the gearbox pipes because they came off so easily with zero broken plastic... Very happy!
There was definitely a bit of buildup on the slow side of the radiator, given how slow it was pouring out, I suspect it's about 20-30s for 250mls...(at a guess) Which means I should also probably replace it too, but it'll do for now. Yet to extensively road test, but it's filled with tap water for now (Sydney has pretty soft water) and will put coolant concentrate in once I'm sure there are no leaks, etc...
The gearbox fluid is quite dark, but I know the torque converter is going, so a little fresh oil won't hurt it... And I didn't do the levels exactly, just filled up the cooler to almost the top and connected it quickly.... Should be approx right!
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