I got no personal expierience with the combo, but it has worked out for some members.
If you have plenty of room for them it may work out fine.
Just take care you got a backup plan in case the fish do not get along.
The oscars may get territorial with any added tankmates.
Only you can judge if it's gonna work out fine.
If you got aggressive o's to begin with, you may be looking at fights, even to the death.
Parrots are known to be fin nippers and oscars may not be too gentle if they are getting "nipped".
but i'm sure some other expierienced members may have some more input for you.