The original colours were used to distinguish easily between two main types of coolant, but now don�t actually mean very much because there�s no regulation on them. With so much variation in available coolants these days, don�t rely on the colour of what�s in your reservoir to make a guess. Check your car�s maintenance manual for what�s required. If you�re unsure, head to your local Kwik Fit centre, where our experts can help you in no time.