纳智捷U6排气管不滴水，有黑灰什么情况大神们？

<div layer1="img-s"></div><div class="tz-picture"><img src="http://club2.autoimg.cn/album/g28/M09/A8/D6/userphotos/2025/05/22/10/500_CjIFVGguhfSARCa6AAeuYjcrhDg114.jpg" style="height:1280px;width:591px"  /></div><div layer1="img-e"></div><br /><div layer1="img-s"></div><div class="tz-picture"><img src="http://club2.autoimg.cn/album/g28/M06/14/AB/userphotos/2025/05/22/10/500_Chtlx2guhfWAdyYPAAfGJrwmd_A691.jpg" style="height:1280px;width:591px"  /></div><div layer1="img-e"></div><br /><div layer1="img-s"></div><div class="tz-picture"><img src="http://club2.autoimg.cn/album/g28/M00/A8/D6/userphotos/2025/05/22/10/500_CjIFVGguhfaAYtMIAAkms0a44c8709.jpg" style="height:1121px;width:635px"  /></div><div layer1="img-e"></div><br /><div layer1="img-s"></div><div class="tz-picture"><img src="http://club2.autoimg.cn/album/g32/M01/56/5C/userphotos/2025/05/22/10/500_ChxkPmguhfiAUBUUAAcpMRWZ5WA401.jpg" style="height:856px;width:642px"  /></div><div layer1="img-e"></div><br /><div layer1="text-s"></div><div class="tz-paragraph">我才跑了50000多公里，跑高速也不滴水也有黑灰，我看了火花塞和氧传感器都还好吧</div><div layer1="text-e"></div><br />