It's not the first time I take OLY under away and this time I will just add some statistics, as I don't want to repeat myself time after time.
Olympakos away this season: only 4/19 over this line. No more than 167 points in any game in regulation.
Against Real in Spain in 2000s: 13 games played, 0 over this line. Max total 159.
Real is obviously the favourite and the only way for OLY to win, is to limit transition and make this game as slow as possible.