What anitfreeze do I use for my 1990 honda civic si?

I am tuning up my car and I want to know which antifreeze should be used for my 1990 honda civic si?What anitfreeze do I use for my 1990 honda civic si?The owners manual will specify what kind.However,my Honda is happy with "Pre stone"50/50 premix.This is good time(while radiator is drained)to check hoses,thermostat and radiator cap.