About three years ago, after reading about it in these pages.
I did the "over 100,000 miles vehicle" version of it. My car was burning oil but not smoking. Took me about 3 months at the time with all the cycles they have you do. I also replaced the valve stem seals and the valve cover gasket. Once the seals settled in which also took some time, the change and improvement were very noticeable. I was/am very pleased. The photo they have on their site however, is for true believers...
The insides of my engine never "regained" that new high polish you see in the photos. Mine Still looks like it has been hard at work for a while.
1987 300SE Euro _ M103