There are many consumables in cars, such as engine oil, brake fluid, antifreeze, wiper water, etc. Car maintenance cannot be completely based on the user manual, because each car is in a different environment. One car is often driven in a dusty area, and the other car is driven in a clean air area every day. The maintenance time required for the two cars will inevitably be the same, depending on the actual situation. Therefore, whether to replace them during car maintenance is one thing, But it must be checked by the maintenance technician.

机油是发动机里必须用的润滑油，每一款车对机油的性能要求不同，越是豪华车要求越明确，所以，豪华车辆都是用指定类型的机油，不能乱用，例如，宝马汽油车用0W30全合成机油；宝马M型运动型车就用M型特殊机油，如果宝马车辆在使用过程中没有加正确的机油型号，会对发动机引擎造成损害。具体到多少换机油，根据使用手册要求来就好。

Engine oil is a lubricating oil that must be used in the engine. Each car has different performance requirements for engine oil, and the more luxurious the car, the clearer the requirements. Therefore, luxury vehicles use specified types of engine oil and cannot be used indiscriminately. For example, BMW gasoline cars use 0W30 fully synthetic engine oil; The BMW M-type sports car uses M-type special oil. If the BMW vehicle does not add the correct oil type during use, it will cause damage to the engine. The specific mileage for changing the oil should be determined according to the instructions in the user manual.

发动机的温度是由防冻液来降温的，水泵把防冻液压入引擎的每条管道，通过防冻液传温来降低发动机温度，汽车工作需要达到一个特定温度，在212华氏度左右，防冻液就是这样的一个媒介，一般是5年或5万英里换一次。宝马汽车有专用防冻液，为什么别的车能用水，而宝马车不行，不是说不行，水在高温时会产生水垢，长期使用会降低对发动机的降温效果。

The temperature of the engine is cooled by antifreeze, which is hydraulically injected into each pipeline of the engine by a water pump. The engine temperature is lowered through the transmission of antifreeze, and the car needs to reach a specific temperature, around 212 degrees Fahrenheit. Antifreeze is such a medium, usually changed every 5 years or 50000 miles. BMW cars have specialized antifreeze, why can other cars use water while BMW cars cannot? It's not that it doesn't work. Water can produce scale at high temperatures, and long-term use can reduce the cooling effect on the engine.

变速箱油通常3万英里换一次，和发动机油一样，变速箱油同样是要用专用型号，但宝马车会注明使用了长效变速箱油，如果没有发生漏油情况，我们是不需要换的。但是要换一定要换专用油，因为变速箱齿轮需要油来润滑，以及达到紧配合作用，不同型号油会损害变速箱使用寿命。

The transmission oil is usually changed every 30000 miles. Like the engine oil, the transmission oil also needs to be a specialized model, but BMW cars will indicate the use of long-lasting transmission oil. If there is no oil leakage, we do not need to change it. But if you want to change it, you must change the special oil because the gearbox gears need oil to lubricate and achieve tight fitting. Different types of oil can damage the service life of the gearbox.

刹车油是大家很关注的，汽车没刹车或刹车不好都无法想象，宝马车使用的是DOT4的刹车油，这种油有很高的沸点特性，刹车油在使用过程中会产生水蒸气挥发，建议宝马车辆每两年换一次，不过要根据车辆使用环境而定，要是车经常在灰尘大的地方开，不可避免灰尘会进入储油室中，检查发现刹车油里有很多灰尘，即使不到2年时间，也应该换掉。

Brake oil is of great concern to everyone. It is unimaginable that cars do not have brakes or brakes are not good. BMW cars use DOT4 brake oil, which has a high boiling point characteristic. During use, brake oil will produce water vapor evaporation. It is recommended to change BMW vehicles every two years, but it depends on the vehicle's usage environment. If the car is frequently driven in dusty areas, dust will inevitably enter the oil storage chamber, Upon inspection, it was found that there is a lot of dust in the brake fluid, which should be replaced even if it takes less than 2 years.