Black spots on trunk 2.0tfsi

[Keks3003]

Hello guys, im having problem with my mark 5. Every time after ride i have black marks on trunk. I dont what could be it. Oil is ok, in 6000km only 0.6 did take, so oil isnt... Any idea ?

[pudding]

Sooty tune?

[Keks3003]

Could it be from faulty thermostat ? Just came from drive, and the car did not get to 90° after 25min of ride....

[pudding]

Yeah I would replace the thermostat first and go from there.

[ljc19630]

Can you see if the thermostat sits at 90degrees? That’s also a sign that it needs replacement if not ?


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[DBXdarkangel]

Black exhaust soot is faulty thermostat? Interested in this as mine has black soot for past 5 yrs

[Keks3003]

Can you see if the thermostat sits at 90degrees? That’s also a sign that it needs replacement if not ?


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No doesnt sit at 90, only at stop will come to 90.  I will try to replace it.

[pudding]

Black exhaust soot is faulty thermostat? Interested in this as mine has black soot for past 5 yrs

It's not the sole cause, but a contributing factor. 

TFSIs are very sooty engines anyway because of how they operate.  Remaps compounds the problem but I've seen standard cars chucking out black smoke under hard acceleration as well, so not a lot you can do about it really, other than convert the engine to port injection!

[Mekaniko]

Mine have the same... maybe the coils? As all the petrol could not be burn?

[RBS]

  Isn't that just condens which is blow out of the exhaust?

[pudding]

I would only expect steam/boost to blow some accumulated soot out of the exhaust if it does mostly short journeys, but a daily driven car doing a reasonable amount of miles shouldn't do that.  Mine doesn't, and never has.

[Mekaniko]

Well yours is black... but I think that is not normal too.

Mine is doing it since at least 3 years ago and still running perfect.

[pudding]

You can still see soot and oil spotting on a black car..... especially when it's dirty.

[LC5F]

What's your oil consumption like?
Mine used to chuck out a lot of soot and I could see in the mirror on hard acceleration a plume of stour/dust coming out the exhaust. Tail pipe and bumper sooty.
Mine had high oil consumption, changing to thicker oil helped but still high, double the recommended at 2 litres per 1k miles - eventually pinned this down to blown oil seal in the hot side of the turbo.
Now I barely have any soot on the exhaust & oil consumption has quartered.

[FatWelshBoy]

Perfectly normal, mine does it and when I've had a look at other cars they are the same.