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After much reading at Bobistheoilguy, I decided to give Auto RX a try. My truck has a little over 76,000 miles on it, and has been meticulously maintained. I felt like the engine internals should be fairly clean because I always changed the Castrol GTX at 3,000 miles, and after switching to Mobil 1 never missed the 5,000 mile mark. The main reason I wanted to try the Auto RX was fuel economy, I'm spending more on gas than my truck payment! I'm about 400 miles into the "cleaning phase" (using Castrol GTX and a Super Tech filter), and noticed something unexpected - my timing chain rattle is almost nonexistent! The motor has never been this quiet, even after the dealership pulled the motor and replaced both timing assemblies. I don't know if its just the added volume (5 qts oil and 10 ozs Auto RX) in the motor, or if the product is cleaning the oil passages and allowing the oil to reach the timing chain tensioners faster. Probably too soon to tell, but I can't wait to see what happens when the application is over and I switch back to Mobil 1.
No, I'm not either. I frequent several Ranger forums, and like to share info with all of them - because I gain info from all of them. I posted the thread in the "Ranger" forum for the obvious reason, and in the "Oil and Lubrication" because it is not limited to Ranger owners - I believe that other people may be interested. As far as I know, the only place you can purchase Auto Rx is from the inventor's web site...