Rainboe: One last time! I have never seen ice below -40C in over 20,000 hours flying, and do not accept it actually forms.
I have
never seen ice form inside an engine, period and am unlikely to ever do so. Doesn't mean I'm going to wait until I personally experience a rollback or flame out in conditions where ice should not form, or discount the ice crystal phenomenon or ignore manufacturers recommendations to counter the risk.