https://youtu.be/q0XAvr5Qn1k?si=RBwsH1-CgnlypdXm&t=352
I do, it's the whole point of the rabbit hole. i guess you're in the camp of only morons would put any kind of grease there?
Sorry mate you said PF BBs in the post, I guess just a typo... That's a tf in the vid. I'm sure you already know this, but there is an alu insert which is pressfit and bonded into the carbon hole in the frame, which has threads on the inside, which the bb threads into. Yeah I'd use an nlgi00-2 grease or anti-seize for threaded bbs that tighten under load. I think anti-seize might make more sense here. Ones that don't tighten under load, I'd use threadlock, but that's hardly any these days.
Although, if it's a pf, like what you said, then retaining compound between the carbon and bb. Usually 641.
If yours creaks and is a pf and not tf, then you may wanna push it out and measure it up. If the hole is too small, you can hone it safely (takes about 30min to remove 0.01mm, so it's hard to overshoot it), if hole too big you can use 638 instead of 641 for retaining compound, as it'll fill a much bigger gap more betterererer.
Sometimes creaks can come from other stuff though, like chainring bolts being uncooperative, or just grit stuck between the crank arms.
