发动机保养：发动机是汽车的心脏，正确的操作和及时的维护保养非常重要。经常短距离行驶可能会导致进气道和汽缸内部形成积炭，影响车辆性能和燃油效率。因此，清除积炭是换季保养的重要步骤。

　　Engine maintenance: The engine is the heart of a car, and correct operation and timely maintenance are very important. Frequent short distance driving may lead to the formation of carbon deposits inside the intake duct and cylinder, affecting vehicle performance and fuel efficiency. Therefore, removing carbon deposits is an important step in seasonal maintenance. 

　　外观和内饰保养：雨水中的酸性成分会对汽车漆面造成腐蚀，因此建议进行漆面美容或封釉处理以保护车漆。此外，检查玻璃水是否充足也很重要，以避免驾驶视线受阻。

　　Appearance and interior maintenance: The acidic components in rainwater can corrode the car paint surface, so it is recommended to perform paint beautification or glazing treatment to protect the car paint. In addition, it is also important to check whether the glass water is sufficient to avoid obstructing the driving line of sight.

　　轮胎保养：轮胎是车辆与地面唯一接触的部分，其状态直接关系到行车安全。长途行驶后，应清理轮胎纹内的石子，并检查轮胎的磨损情况，必要时进行调整或更换。

　　Tire maintenance: Tires are the only part of the vehicle that comes into contact with the ground, and their condition directly affects driving safety. After long-distance driving, the stones inside the tire tread should be cleaned, and the wear of the tire should be checked. If necessary, adjustments or replacements should be made.

　　刹车系统检查：刹车系统的健康状况直接影响到行车安全。频繁使用刹车可能导致刹车片磨损，出现异响或刹车不足的情况应及时检查和更换。

　　Brake system inspection: The health condition of the brake system directly affects driving safety. Frequent use of brakes may cause brake pad wear, abnormal noise, or insufficient braking, and should be checked and replaced in a timely manner.

　　底盘系统检查：底盘承受着来自路面的冲击，长途行驶后应检查底盘螺丝是否松动，并进行必要的紧固。此外，四轮定位的检查和调整也是必要的。

　　Chassis system inspection: The chassis is subjected to impacts from the road surface. After long-distance driving, the chassis screws should be checked for looseness and necessary tightening should be carried out. In addition, checking and adjusting the four-wheel alignment is also necessary. 

　　宝马X5的常规保养项目和费用：宝马X5的保养包括更换机油、机油滤清器、空气滤芯、空调滤芯等。不同配件的更换周期和费用有所不同，例如，机油和机油滤清器每10,000公里更换一次，空气滤芯每20,000公里更换一次。具体费用根据配件的品牌和规格有所不同。

　　The routine maintenance items and costs of BMW X5: The maintenance of BMW X5 includes changing the oil, oil filter, air filter, air conditioning filter, etc. The replacement cycle and cost of different accessories vary, for example, the oil and oil filter should be replaced every 10000 kilometers, and the air filter should be replaced every 20000 kilometers. The specific cost varies depending on the brand and specifications of the accessories. 

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