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Black exhaust soot?!

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Old 11-21-2017, 06:14 PM
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2014 Lexus IS350 F Sport
Black exhaust soot?!

Has anyone with an AMG exhaust noticed the crazy amount of black dust coming out the exhaust? Is that just me or is it normal? I do drive the car in S+ and exhaust open quite a bit.

Last edited by sinaca; 11-21-2017 at 06:16 PM.
Old 11-21-2017, 06:38 PM
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Strange.. I don’t have any.. are you burning oil? Maybe cracked rings on your pistons?
Old 11-21-2017, 07:12 PM
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Yeah it is normal when your on it specially in S+
Old 11-21-2017, 07:33 PM
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Originally Posted by Gungaslow
Strange.. I don’t have any.. are you burning oil? Maybe cracked rings on your pistons?
The car is a 2018 with a 1000 miles on it, so I hope that’s not the case!
Old 11-21-2017, 07:38 PM
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I wouldn't worry, it's normal.
Old 11-22-2017, 09:04 AM
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my guess is a direct injection by product. you see everyone worrying about carbon build up on valves so maybe mercedes figured out how to blow it out the tail pipe. I had it on my c250 and now on my c43. never had it on my older benz with m112 NA engine.it seems to be normal, if not my car is screwed too.

A little bit of adams polish all purpose cleaner and the exhaust brush takes it right off.
Old 11-22-2017, 09:30 AM
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I got my car detailed last week. This week it is all black. So no, its not only you, haha.
Old 11-22-2017, 03:05 PM
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If you're tuned, its even worse. I used alloy rim cleaner and metal polish to get it clean again.
Old 11-22-2017, 04:43 PM
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Interesting ... I just checked mine and they're very clean. Even wiping my finger along the inside edge of both the chrome surround as well as deeper inside the pipes doesn't yield a black mark on my finger. WA gas in our area is 10% ethanol. My car has about 6,900 mi (about 11,100 km) on it ... though I did take great care to break it in properly.





... and in response to later postings, the PE is enabled about 2/3 of the time and there's enough WOT to get things sooty if it was going to happen. I've not even had this issue after performance driving events.

Last edited by user33; 11-23-2017 at 02:50 AM.
Old 11-22-2017, 05:35 PM
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Exactly.. mine looks like yours.. surprisingly clean
Old 11-22-2017, 06:39 PM
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If yours is clean, you dont WOT your car through the gears very often.
Old 11-22-2017, 07:09 PM
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Another explanation is the clean ones can also be non PE cars, so they run leaner than the other ones.
Old 11-22-2017, 07:15 PM
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My car is white.
After a nice drive the rear end is blackish.

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