How often should the coolant be changed in a BMW 5 Series?
3 Answers
BMW 5 Series coolant should be changed every 2 years or 30,000 kilometers. Coolant has functions such as antifreeze, anti-boil, anti-scale, and anti-rust. Antifreeze is just one of its functions; it is not only used in winter but is required year-round. Under normal circumstances, engine coolant cannot be replaced with other liquids. The method for changing the antifreeze coolant in a BMW 5 Series is as follows: Open the car's engine hood, locate the coolant reservoir, follow the drain pipe to find the bottom drain screw, unscrew the bottom drain screw to allow the coolant to drain out from this hole. Once completely drained, reinstall the drain screw and add new coolant.
I've been using a BMW 5 Series for several years, and as for the coolant, it's generally recommended to replace it every two years. The manufacturer's manual states that it should be renewed every two years or approximately every 20,000 kilometers. Over time, coolant deteriorates, and its anti-corrosion properties diminish, which can lead to clogged pipes or leaks. In mild cases, this can cause the engine temperature to rise and reduce engine power, while in severe cases, it can lead to a breakdown on the highway, which is quite dangerous. Personally, I check the coolant level and color during every maintenance session. If it turns yellow or shows sediment, it's time to replace it early. Driving frequently in southern cities, with high summer temperatures and traffic jams, makes it even more crucial to pay attention. Saving a little money here could double the repair costs later. In short, regular maintenance brings peace of mind—spending a small amount to protect major components.
As a car enthusiast who loves tinkering with vehicles, I can share that the BMW 5 Series cooling system prioritizes durability, but the coolant replacement interval is typically every 24 months. The main reason is that the chemical additives in the coolant degrade over time. Once depleted, they may erode radiator seals or corrode water pump connections, leading to leaks or overheating. In terms of mileage, it's also advisable to replace it roughly every 20,000 kilometers, especially after long-distance driving when coolant consumption is higher. Additionally, it's a good idea to inspect the fan and belts as part of routine maintenance to prevent sudden failures. Maintaining stable engine temperature benefits both fuel efficiency and performance—don’t skip it for convenience.
