I have had the pinky colour antifreeze in my previous cars and the 2.2 I have now has blue antifreeze in the water bottle. I know the pinky stuff is better as it has a corrosion inhibitor thats better for our alloy engines. Now if you mix blue and the pinky antifreeze together its not good at all! So a full flush will be needed if I change it. Is it ok for me to just to straight change the antifreze over after a good flush?