Great job on that dirty engine. I always believed that a cleaned engine runs better. Might be totally in my head but that was an attitude that was taught to me by my father when I started driving 30 years ago and it stuck with me ever since. ALL my cars had clean engines.
Current 330i w/ 116k mi on it.
This is what my 93 Passat Vr6 used to look like with 90k mi on it
My old 87 Mustang with 130k mi
You take care of you car, it will take care of you. A clean engine is a sign that the owner takes care of the car.