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      09-19-2021, 09:11 PM   #1
Madnking
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2016 m6 grey smoke

I have a 2016 m6 48k miles. Catless, stage 2 tune, and project gamma intakes. Runs and drives great no codes. The other day when i was casually accelerating I look in my mirror and saw a grey puff of smoke a few feet behind my car. To day sitting at a stop sign I waited a few seconds and normally accelerated watched in my mirror and saw a puff of grey smoke coming from from car. I tried to replicate it by stopping and starting but I couldn't. The car has no smoke on cold startup or idling. Im leaning towards turbo seal based on what I read online. I am assuming I would have more smoke on startup and idling if this were valve stem seals. Any suggestions thanks
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      09-19-2021, 11:26 PM   #2
arucano
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That can be a sign of leaking valve stem seals or Crank Case ventilation valve.
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      09-20-2021, 04:56 PM   #3
Whipple
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Quote:
Originally Posted by Madnking View Post
I have a 2016 m6 48k miles. Catless, stage 2 tune, and project gamma intakes. Runs and drives great no codes. The other day when i was casually accelerating I look in my mirror and saw a grey puff of smoke a few feet behind my car. To day sitting at a stop sign I waited a few seconds and normally accelerated watched in my mirror and saw a puff of grey smoke coming from from car. I tried to replicate it by stopping and starting but I couldn't. The car has no smoke on cold startup or idling. Im leaning towards turbo seal based on what I read online. I am assuming I would have more smoke on startup and idling if this were valve stem seals. Any suggestions thanks
Hi,Do yourself a favor,go to a shop and have them do a compression test done on all cylinders ,I doubt its the valve guide seals on such low mileage and leaky oil in the turbos are not common on these engines, you might have a broken piston ring land,I just went through the same scenario and its the same symptoms, my car got much worse with smoke overtime then I had to get rebuilt
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