The Ultimate Guide to Coolants for BMW, VW, Audi, Mini Cooper, and Mercedes What Is Coolant and Why Is It Important? Coolant, also known as antifreeze, is a crucial fluid in your vehicle's engine cooling system. It prevents overheating in summer and freezing in winter while protecting engine components from corrosion. Over time, coolant degrades, leading to sediment buildup that can clog your radiator, water pump, and heater core, potentially causing severe engine damage. Types of Coolants by Color and Brand Different car manufacturers use specific coolant formulations designed to work with their engines and materials. Using the correct coolant for your vehicle ensures optimal performance and longevity. Here’s a breakdown of common coolant colors and their applications: Blue Coolant Used by BMW, Mercedes-Benz, Mini Cooper, and some Volkswagen models. Formulated with organic additives to provide long-lasting corrosion protection. Typically comes as a c ... read more