helo dear , i recentelly checked the price of cultus radiator , it cost 6 to 8K , and caltex coolant which comes in orange color is best , there are many local made which i think nothing more than just green colored water like Nasa , Osaka ect they are all useless , there is another local brand name Guard , which also make filters , i guess they have some quality standards and there coolant may be of good quality , i will try it , few weeks before i check its prices , i dont remember exzactelly but i think 4 or 5 liter can was of some where below 500 , price figure was in 400 ,