[Matticus91]

I've seen tons of before/after sets from N54's but very rarely do people do the same job on the N55's since it has been determined that they are less likely to build up carbon on the valves due to changes since the N54. Purpose of this post is just to help N55 owners find an example of carbon buildup vs an N54.

The attached images are from GoodMoodley who had his N55 walnut blasted at 45,000 miles while doing a turbo upgrade and some other work. It shows that there is some discoloration and slight carbon buildup, but nothing like what we'd see on an N54 with the same mileage. First two images are before the walnut blast, second two are after. He does not have a catch-can or any other intake mods that would impact these results.

This isn't going to reflect results from every N55, but it can help give people an idea of what to expect. I'm approaching 75k miles in my 135 now and will likely do a walnut blast at 80k just as a preventative measure, and since it can only really help anyway.