Originally Posted by Mitco39 (Post 2912404)

Thats not entirely true. I have seen the inside of diesel engines on farm trucks driven by old farmers with nothing out of the ordinary in terms of build up. I mean you always will have some but nothing to affect performance a noticeable amount or anything like that. Surely nothing like that picture. I suggest deleting the external EGR where ever possible, its just not a good setup. Most new cars just have a internal EGR by changing the cam degrees with respect to each other.

I bet if there was a way to turn this off on the Z you would see both fuel mileage and power gains from it. The Z does not have external EGR system on it, so it only leads me to believe it is controlled by the VVEL.

Originally Posted by DLSTR (Post 2912511)

VW/Audi have addressed the build - up problem in the newest designs. That being said its not a game ending deal to have this problem. You figure maybe once in the life of the car you will have to clean. Most folks just dont keep them that long to begin with. I wont have my GTi until 100kmiles. If I do it would be a MIRACLE :)