Lathe Metalworking

i have a mitsubishi lancer 1.6 2007 glx i live in egypt , and i want to change my coolant , is the users manual it says the recommanded coolant is dia queen super long life, but they dont sell this kind of coolant here in egypt, i even asked the dealer for what kind of coolant i should use and the answer was anything ! ofcourse they dont know anything and they r stupid enough to give such an answer ! i bught preston prediluted coolant but at the back it says for flush and refill u must use concentrated formula ! we dont have that type either! and my user manual says i have to change the coolant every 40,000km iam 60 already ! what shall i do !
the coolant i already have is green colored , and what am i trying to say i dont have this kind of help that some shops would offer to know what brand of coolant to go with! thats why am asking u guys, is the prestone prediluted one ok or not !