Every vehicle on the road relies on a system of fluids to function properly — much like the human body depends on blood and water. These fluids don’t just “sit there.” They work actively to lubricate, cool, clean, and protect key systems in your car. Skipping out on monitoring and maintaining them can lead to performance issues, costly repairs, and even safety concerns.

Let’s take a deeper look at four of the most important fluids your car needs to stay healthy and road-ready: engine oil, coolant, brake fluid, and transmission fluid.

Engine Oil: The Lifeblood of Your Engine
If there’s one fluid every driver knows about — or at least should — it’s engine oil. Itplays a critical role in keeping your engine's moving parts lubricated, reducing friction, and preventing overheating. As it circulates, it also helps carry away small particles of debris and carbon buildup, keeping your engine cleaner.