Cant remember, had it written down from a google search ages ago lol.
anyway, i know for a fact that a lot of specalist mechanics with a lot of experience on the impreza recomend it, i can also tell you that there is a lot of impreza owners with this oil in there car and have had great results from it, And a few specalist workshops that i know of use it,
I personally run and maintane my own car, and have had great results from 10w/60
Im not looking for an argument here but if you have no engineering background and dont own/run an impreza, then your opinon will be based on slighty different knowledge than my own.
cheer up its nearly summer lol