I have no idea how tightly those things are sealed. Given some of the watch tests in this thread (the olive oil one), it surely can withstand the positive press

I have no idea how tightly those things are sealed. Given some of the watch tests in this thread (the olive oil one), it surely can withstand the positive pressure but I'm not certain it could withstand negative pressure. If oil got in there, that oscillator would never keep the correct frequency again. Hopefully someone does some tests.