新车跑400迈高速发现后门处积了些黑色的污垢，正常不？谢！

所有跟帖： 

• 后门 or tailpipe? if latter it's abnormal -internuts- ♂ (0 bytes) () 09/16/2009 postreply 14:26:44

• why abnormal? 我的车尾气口一直黑区区的，地雷说正常。 -1800800- ♂ (100 bytes) () 09/16/2009 postreply 16:37:40

• for a 4000mile new car, tailpipe should be clean relatively -internuts- ♂ (210 bytes) () 09/16/2009 postreply 17:03:35

• question for （3）为何厂家要这样做? 是设计有问题还是想榨出more hp -1800800- ♂ (0 bytes) () 09/16/2009 postreply 19:19:28

• program not optimized -internuts- ♂ (409 bytes) () 09/17/2009 postreply 08:40:40

• 3ks -1800800- ♂ (0 bytes) () 09/17/2009 postreply 16:22:18

• 是后门不是 tailpipe，有人说是air-dynamic，谢大家的回复！ -mlx- ♀ (0 bytes) () 09/17/2009 postreply 10:56:32

• 这也问? -internuts- ♂ (0 bytes) () 09/17/2009 postreply 18:37:28