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By 100,000 miles I think you will find quite a bit of build up. What is interesting though is that while many people are posting that they are observing the build up, they are not very often posting that they are having problems. So generally this seems to be pretty benign. My Ford mechanic did say that the more catastrophic possibility is where a large chunk of carbon breaks loose from a valve and then makes it's way to the turbine and wrecks the blades.

It seems that everyone is going to direct injection, even my wife's new econobox Nissan has a 1.6 liter GDI engine. It will be interesting to find out if these new engines have solved the problem.

Here are some links that were posted earlier:

go to minute 16:13 for this one
https://www.youtube.com/watch?v=z6Uh3wEoNiM


https://www.youtube.com/watch?v=p2coF9M6F_8

https://www.youtube.com/watch?v=Z8RzzwISkTA

https://www.youtube.com/watch?v=nK2eXdaydqI
Don't get me wrong, I don't think the build up is an issue. I know the durability cycles they run on these engines. But at 100,000 it seems like it's something I should do just to do it.

Also everything is DI now, and I mean everything, even Chrysler is moving to DI and they are the last to do ANYTHING. However dual port designs are coming (Audi has them in Europe), so this will be a "generational" issue.
 

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Went in through the symposer port with a camera tonight to get a shot of the valves. I've seen worse, but they're not great. 2017, 24,000 miles. Wondering if I can just unbolt it and pull it away far enough to do the cleaning without undoing all the sensors, vacuum lines, etc. Will need to put the car up on ramps so I can rotate the crank from below, and close the valves. Hose them down with CRC (CRC Industries Awarded Patent for Innovative GDI Cleaning Technology - CRC Industries | Global Supplier of Chemical Specialty Products), take some sort of bottle brush to them, and suck out the garbage.

Anyone here taken this on yet?


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I have 16 fost bought new 80k miles now.Put damond crank case occ on at 34k.Have used crc di cleaner 3 times.I attach hose to occ hose and sit in seat to work throttle whole spraying.Takes about 35 minutes.Have big intercooler car runs great.I am happy with this procedure.
 
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