for a 4000mile new car, tailpipe should be clean relatively

there are three possible cases resulting in tailpipe black or oily:

(1) diesel engine
(2) high mileage engine - cylinder rings worn
(3) gas/air mixing too rich (japan girl was correct :)
...

所有跟帖： 

• 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