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I think you should spend some time with Snowbum's article about oil coolers:
https://bmwmotorcycletech.info/coolers.htm
Also there are a couple of past threads in the Similar Threads pane at the bottom of the screen.
Looks like this additional page has more info...I notice in the bottom third of the page, Snowbum refers to the -342 pipe.
https://bmwmotorcycletech.info/oil.htm