Thanks Vaqas1 and Mehmood..
Actually i use SEOL coolant 2 bottles(500 ml each) 5 months back with water.
but after 3 months green colour vanished and radiator become rusty, so now i am thinking to clean the radiator and fill it with full coolant.....
what do you suggest?? Beside caltex, since it is expensive. What do you say about DK coolant?? is it better than OSAKA?
your suggestions are valuable for me,,,, thanks