I have a 2006 Hyundai Santa Fe which has always seen regular synthetic oil changes since new using Mobil 1 and Amsoil. I do a lot of highway driving and felt that my engine must be clean... Guess not.
I ran the ARX for 2500 miles (4,000 KM), and not only is my car performing better but my filter is already dirty. I can't wait to see what the filter looks like after the rinse cycle.
Here is a picture of my filter after the 2500 Miles cleaning cycle: