ok cool, do you think this would be good?Sounds like you don't have a lot of time, meaning you may not be able to do enough water changes to keep 2, or much less 4 in good enough water quality to keep them healthy.
Better one lonely oscar (and I don't believe they get lonely) than a few living in their own swill from lack of water changes.
More than get lonely, if their tank isn't large enough for more than one, they get frustrated with lack of space and kill, or badger the other to death in a small tank.
They will however need something to interact with though, if you have substrate, and decor, they will constantly redecorate the tank for something to do.
I know people who give their oscars toy balls or other toys to keep them busy.
150cm x 60cm x 50cm tank
2cm deep gravel
a ayirstone under some smooth stones and a few amazon swords or anubius
a piece of driftwood
once he / she gets larger a ping pong ball or somthing
I can do whatever % water changes weekly but more than weekly is pushing it
do you think a sailfin pleco would be okay with him/her?