hiI am a newbe to this site.My problem is that the tailpipe on my1998 v6 is always black and sootie, it has aprox 17500kls on it , 90% of my driving is at around 100kls. the nearest town is about 20 kls. when i drive too Sydney [round trip 900/1000 kls.] I average aprox. fuel is 9lts. per 100kls.I am old and don`t speed or driv hard. Arth.