Does BMW Antifreeze Need to Be Diluted with Water?
2 Answers
BMW antifreeze needs to be diluted with water, and it can be mixed at a ratio of 1:1. This is because the original BMW antifreeze concentrate is a glycol-based antifreeze with a high ethylene glycol content, accounting for over 90%. When the concentration of ethylene glycol liquid is below 66%, its freezing point decreases as the concentration increases. However, when the concentration exceeds 66%, the freezing point increases with higher concentration. Here are some precautions for using antifreeze: 1. Try to use the same brand of antifreeze. Different brands of antifreeze use different metal corrosion inhibitors, so they should not be mixed. 2. Most antifreeze products have a validity period of two years. When adding antifreeze, ensure the product is within its validity period. When replacing antifreeze, drain the old liquid completely, clean the cooling system thoroughly, and then add the new liquid. 3. Avoid diluting with water. Traditional inorganic antifreeze should not be diluted with water, as it can cause sedimentation and severely impair the antifreeze's normal function. Organic antifreeze can be diluted with water, but the amount of water should not be excessive. 4. For vehicles using antifreeze, never directly add tap water. Instead, use distilled or deionized water. If these are not available, boiled and cooled water is better than tap water. If antifreeze is lost due to leakage, replenish it with the same brand of antifreeze. Antifreeze should be used year-round.
I usually drive a BMW and have had my fair share of experiences with coolant. Generally, you don't need to add extra water because the coolant is already a pre-mixed solution containing antifreeze and corrosion inhibitors. Adding water would dilute it, reducing its winter antifreeze performance or increasing the risk of corrosion. BMW recommends using genuine coolant, like the BMW-specific one, which comes pre-mixed. If you notice the level is low, don't top it up with tap water—using distilled water or buying a top-up solution from the dealership is safer. I check the coolant reservoir weekly to ensure the level stays between the min and max marks. Pay extra attention before winter to prevent engine freezing. Once, I neglected it, and the low level nearly caused trouble during a cold snap—luckily, I added distilled water in time. Regular replacement is also crucial; doing it every two years or as per the manual can extend the engine's lifespan. Remember, ignoring small details can lead to hefty repair bills later, so developing good habits is the most hassle-free approach.
