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I think your reading too much into it, its part of the whole NADS thing, its a combination of mods to aid your engine.
Blocking the EGR is only part of the package, by itself may not make any noticeable difference to the colour of your oil, but its still returning a waste product (exhaust) to your engines insides, your engine does not need or want it , and over time as you engine ages, it may add to problems
I don't think you'l find the EGR valve has even close to a "exact" measure of exhaust entering the cylinders, theres only so much room in the combustion chamber, so you add some exhaust, somethings gotta give, its your air/fuel ratio, a varying air/fuel ratio may lead to further deposits for many resons.
Think of it like eating a little bit of your own poo to save polution, sure, a little bit won't hurt, but over time as you get older, don't be surprised if it leads to problems
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