My Personal Experience
If you want to replace within a year you can go to osaka Coolent but aaj kal ache quality ka nahe aa raha phir be rust aa jata hae
Now last year i filled with Original Toyota Red coolent recently i have traveled pakistan tour more thn 4000km on full a/c havent dropped its level and ALhamdolillah no rust issue and have to replace 40000km or 3 to 4 years rest is ur decision.
Regards