thanks, what's the best way to do that? can i do it or the shop has to do it for me???? i should say that sometimes i smell black smoke coming from the car also, i just had my emission test done 3 weeks ago and everything was fine.

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2004 X5 4.4i (current)
2001 ML 430 (retired)
1998 BMW 540 upgraded to M package (retired)