poured in zic coolant...before puttin it in,i got radiator serviced...n believe me,it was all good inside..i means its pipes were not choked,i wasnt sure about it being clean from inside so being on safe side,i got it serviced,but wen it was opened,i cursed my self
i was using osaka coolant for like one year,n there wasnt any rust in it..so i think osaka coolant was good for anti rust..
but with zic,the temperature dosent goes above half mark with ac on...
so i think,anti rust r most of coolants,but temperature controlling is done best by good coolants..
just sharin my experience..!