空气滤芯并不是拿出来看着很脏了就要更换了，要用气枪吹完再看看被污染情况，再决定是否更换。很多维修技师拿出空气滤芯给客户看，非常脏了需要更换了。说实话，一般空气滤芯用上半年或几个月的话，空气滤芯表面都会附着一侧杂物。很多车主非常相信维修师傅们，一看确实挺脏了就换了吧。
空气滤芯
不用气枪清洁的话，一般保养车辆拿出空气滤芯都是非常脏的。气枪吹过之后清洁效果是非常明显的。为了追求高产值，很多4S店保养基本上都建议更换空气滤芯，成功几率很高的。空调滤芯一般较少维修技师会主动去拆的，因为相对来说拆空调滤芯用的时间比较多，除非客户要求检查，所以只要空调滤芯拆下来，无论是否需要更天换，他们会想尽办法让您同意更换的。
油液
防锈防冻液，一般车辆更换需要一桶足够，有些店一直给客户用两桶，第二桶怎么处理呢，开封后倒下水道或给客户加上一点点，也算是用上了，剩下的再给客户带着。自动变速箱油，单据上打三桶，实际上用两桶也是经常的。希望你遇到类似情况要注意一下唠。
以上内容仅代表小编个人观点，上述情况只出现在个别4S店，并非所有店都存在。
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