it will be ok for now but dont leave it in there long and make sure that yo do a full flush before adding the pre mixed toyota red never mix two diff coolants together The difference between the two colours is that Orange / Red antifreeze contains a different type of corrosion inhibitor that has a much longer life than silicates, phosphates and borates. Orange / Red antifreeze contains organic acids that protect engine parts from corrosion. it is very good for alluminium cylnder heads