EGR Tune up results

[Waterloo]

When I did the egr tuneup, not a few weeks later I had to remove the mandate. I went back in to do what I had to do and was amazed at how quickly the soot returned. I normally only run around 70,000 miles in a year, and was thinking I would need to clean this thing out at the VERY LEAST, twice a year. If I was running some hard miles, I think a quarterly cleaning schedule would be called for. Criminal in my book, because few even know of this procedure, or the damage that is being done by not cleaning the soot out of these motors.