Frank,   This may be premature, since I'm only a quarter of the way through my Auto-Rx regimen, but I'm writing to say thanks for a product that works!  I just completed the first clean phase on my 1989 Mazda MX-6 GT (2.2L Turbo)  with 195K miles and my engine runs smoother, gets better mileage, and performs better than it has in 10 years.  The rings must have been freed up since the turbo spools up MUCH faster now, and the engine just feels more responsive.   I have babied my "baby" since I bought her new in September 1989.  She was the first new car I ever bought.  But when I lived in Richmond, VA, I was 3 miles from the office.  I would often come home for lunch.  Over several years that added up to a LOT of short trips.  Really tough on the engine.  Now I live in the northwest Atlanta area and spend FAR too much time in thick traffic.  Another "tough on the engine" scenario.  Auto-Rx has apparently taken some of those years back off my engine.  It feels GREAT!   My 10-bottle order is not only more for myself, but I have several friends who are ordering through me to get the quantity discount.  I'm spreading the word!   By the way, this product is almost un-American!  (I'm kidding...)  It works, as advertised.  But it works slowly!!!  (as it should)  We in America want it RIGHT NOW.  Auto-Rx doesn't work that way because the task cannot be accomplished in that kind of vehicle (the oil, not the car) quickly.  To be safe, it must be slow and gentle.  But, boy, does it clean!  I'm looking forward to the 2nd clean/rinse phase to see shiny clean metal under my valve cover again!   Regards, Michael Polutta Atlanta, GA