I have been using the SuperTech oil for quite some time now.I do the 3 month/3,000 mile oil changes so it seems to do pretty well. It seems that since the ST has changed to the new bottles,it has cleaned the oil dipstick on my car much better than it did in the past. I know that it was mentioned recently that Exxon/Mobil was possibly the new supplier of the base stock for the ST.Could this be the reason that it is cleaning better? As I said,I have been using the ST for some time now and the dipstick was never this clean. This only happened since I changed my oil 550+ miles ago with the new ST. Has anyone else noticed any changes or found any more info regarding the ST oil?