Another reason why I developed a lot of faith in Lubegard products (before I heard about Auto-RX) was because of what happened when I tried a Lubegard power steering supplement in the power steering fluid of a car I owned a while back. The power steering unit in this car was squealing a lot in cold weather. I added the Lubegard supplement and the squealing stopped-for keeps. It never came back.
Since I have discovered Auto-RX I have become much less likely to use Lubegard products, although I still respect the Lubegard products. Auto-RX seems to do a great job cleaning engines and keeping them clean, and it can even clean transmissions and power steering units. However, for automatic transmissions, I still feel there is a role for Lubegard products in that area.
In my entire life I have found only a small number of supplement, cleaning, and wear reducing products that actually seemed to work. There were some Lubegard products in that small number. But the one product that for me stands above all the rest is Auto-RX. For cleaning fuel systems I like the Pennzoil Gummout. I have not forgotten the other few products that worked, but here are two now that I actually use (other then stuff for lubricating car locks,etc). Otherwise I stick just to good quality motor oil, fuel, etc.