I can't put any 5w30 in my 2010 WRX. The engine just eats it up like candy and I have to top it off every couple of fuel fill ups. Doesn't matter the brand, just eats it right up. So I made the switch to T6 a while back and now I barely have to top it off every 1500-2000 miles. Of course I drive my modded WRX hard unlike some of the sissy's I hear.
PS Mobil 1 5w30 was the worst oil ever for my WRX....however my Z06 loved it. Its not a bad oil.....its just not very good for turbo Subaru's.