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Has anyone tried immersion cooling (i.e. submerging an RPi in mineral oil)? Tempted to try it myself; just need some spare time (that I don't squander by commenting on Hacker News ;) ).

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Yes it has been done, and works[0-3], it's just a matter of effort vs reward. Generally a simple heat sink and/or small fan setup works fine for nearly any usecase the Pi is designed for, and if you really do need to do heavier loads that require that level of effort to cool, then you probably shouldn't be using a Pi in the first place.

[0] https://www.youtube.com/watch?v=yJRrGCqG9Jc

[1] https://hackaday.com/2018/08/13/oil-immersed-raspberry-pi-ke...

[2] https://hackaday.com/2017/05/15/liquid-cooling-overclocked-r...

[3] https://www.reddit.com/r/raspberry_pi/comments/bmeklj/pi_imm...

If it's just for fun, then I think water-cooling Pi's looks way more interesting to play with:

http://finniss.net/water-cooled-raspberry-pi/

https://modmymods.com/modmymods-raspberry-pi-mini-water-cool...

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