Anyone try this? Just for kicks, I added a bottle a couple of months ago and am curious to see what it does. I will soon cut up the filter to see what kind of deposits are left. I have approximately 3500k on the oil since I put it in. It's supposed to melt away the sludge and clean everything up inside the engine. I am just too cheap to get the auto-rx yet I really dont know what to expect since the engine looks new through the oil fill.