Guys,

Now I have a comparison........












My valves on the right photo below.




I think by 100K miles USA freeway kind of driving and not bumper-to-bumper traffic jam all the time my engine operating profile is, the carbon would be decently a lot.

If in my city, 100K miles wont happen for my car, not in another 30+ years ...LOL
I am now at 23K miles and max will do 4-5K miles a years if I do Jakarta-Bali, otherwise under 1.5 to 2K miles a year if only Jakarta.

 

I have not heard that mercedes DI engines have the same issues with carbon buildup as BMW or Audis, hopefully this is not very common. I give mine the old Italian tuneup frequently, so hopefully that can help mitigate some of the potential issues. At around 55K now on mine

 

It is a fact that Audi and BMW earlier engines have more carbon build up, if Audi it is so proven.
MB seems to have better PCV system than Audi, BMW I do not know.

All DI engine will have carbon build up, no matter what brand of car, it is just how severe per say 100,000 miles will it be ?
Lexus/Toyota is so upset with DI, as such it is one of the rare engine in the world to use both DI and Port Injection, as a way to reduce carbon build up.

Go to this channel, there was a valve inspection on the dual injector type Lexus/Toyota engine. I believe he did not mention mileage of the said car.




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I hope Italian tune up will help too
If I can't find time for the quiet late nite time to do my Italian tune up on the new found highway , where I can do easy WOT from 1-2-3-4th gear, what I would do at a more crowded highway is to use MANUAL and
maintain no lower than 4,000 RPM for a good 7-10 minutes.


What I see set MB engines, at least M276 and M278, a part from Audi is : the centrifugal oil separator driven by the camshaft.
You can't get better oil separation than a powered-spinning type device, compared to a non powered spinning air by venturi shape shape yada yada found on the Audi.
As for our M276 3.0, we have the extra small black plastic oil separator at the Vee bank, that helps too.

If you want to see how good oil separation is, look at the intake manifold after the throttle body if not aftercooler core air side see how dry of oil it is.

On M271 engine, its a complete oily mess at the air to air aftercooler, as such the throttle body intake side ( before throttle body ) is so wet with oil.
Too bad I did not get to see its intake manifold but I can assure you, it will be oil mess too.

As the name implies oil separator is liquid oil separation from the oil vapor.
The oil vapor we can't do anything about it, our engine will consume it.....but if too much liquid oil enter the manifold, surely more carbon build up at the intake valves.

 

Thanks for posting the video, good for future reference.

 

Thanks as always @S-Prihadi

Latest VW/Audi/Porsche/Bentley EA839 3.0L T/2.9L TT DI V6 at 48k miles video and photo below. This engine uses a "catch can" PCV concept with an oil-vapor separator on one of the cylinder heads. It acts as a chamber or labyrinth to help remove oil vapor from the crankcase gases. Time = 11:00 in the video is where he shows the intake valves.

The Audi/Porsche/Bentley/Lamborghini EA825 4.0l TT DI V8 is a related engine which has a similar PCV system as the 2.9L V6.

The MB M17x 4.0L TT DI V8 uses the same PCV principal as the VAG engines listed above. However because the PCV vapor separators are plugging on the M17x, crankcase pressure buildup is causing rear main crankshaft oil seal failures. Read about it on this site in the AMG W213 section.

 

VAG 3.0L T DI V6 from the same YouTuber.

32,000 miles, this valve looks OK to me.

Time = 1:00 is the intake ports and valves.

 

I believe a catch can and blow off valves would eliminate the little problem altogether. But I mine gets the italian tune up all the time so I am not too concerned