Not recommended — a platy and oscar are a risky mix.
Temperatures line up — both thrive around 74–80°F.
pH preferences overlap (7–8) — easy to keep both comfortable.
The oscar is big and predatory enough to eat the platy — likely a meal, not a tankmate.
The oscar is aggressive and will likely harass or harm the platy.
Plan on at least 55 gallons for the pair (the larger of their two minimums).
Can a platy and oscar live together?
Not recommended — a platy and oscar are a risky mix. Minimum tank for the pair is about 55 gallons.