Procedure notes
Adding engine coolant (also known as antifreeze) to your 2012 BMW 550i xDrive is pretty easy. Engine coolant / antifreeze circulates through your engine to keep it cool in the summer but won't freeze in the winter. Make sure to check your engine when it is cold for an accurate reading. The video above shows you where the coolant reservoir in your 550i xDrive is located and how to add coolant / antifreeze. Be sure to check your owners manual to determine the correct type of fluid to add - for BMWs, it will typically be in a section titled Fluid Capacities in the back of your manual. Mix the coolant / antifreeze with distilled water so that you have a combination of 50% coolant and 50% water. Some coolants will come premixed-that is, you don't need to add any water. These coolants will typically say 50/50 or pre-mixed on the front of the coolant bottle.
Removing the coolant reservoir cap on a warm engine could cause the cap to fly off at a high rate of speed and fluid to spray out of the reservoir. Always wear safety goggles when working on your 550i xDrive. Promptly wipe up any spilled fluid as it is highly toxic. Animals love its sweet taste, so even a spilling a small amount on your garage floor can end up in the dog's stomach pretty quickly. If you notice an oily surface in your coolant, immediately have your mechanic inspect your 550i xDrive for head gasket leakage
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向您的 2012 宝马 550i xDrive 添加发动机冷却液（也称为防冻液）相当简单。 发动机冷却液（防冻液）在发动机内循环，在夏季帮助散热，在冬季起到防冻作用。 请在发动机冷态时检查发动机，以获得准确读数。 上述视频展示了您的 550i xDrive 车型冷却液储液罐的位置，以及如何添加冷却液/防冻液。 请务必查阅您的用户手册，以确定应添加的正确类型液体——对于 宝马 车型，通常会在手册的末尾部分找到名为‘液体容量’的章节。 将冷却液/防冻液与蒸馏水混合，使冷却液与水的比例为 50% : 50%。 部分冷却液已经预先混合——也就是说，无需添加任何水。 这些冷却液通常会在冷却液瓶的前面标明 50/50 或为预混型。
在发动机处于热态时拆除冷却液储液罐盖，可能导致盖子以高速飞出，冷却液从储液罐中喷出。 对 550i xDrive 进行相关作业时，请始终佩戴护目镜。 立即擦拭任何溢出的液体，因为它具有高度毒性。 动物喜欢它的甜味，因此即使在车库地板上洒出少量，也可能很快进入狗的胃里。 如果发现冷却液中出现油状表面，应立即请维修人员检查您的 550i xDrive 是否存在气缸垫渗漏