Man I just don't get it on all these different flush products or motor cleaners. Everything I have read on here points away from using gunk and some of the cheaper stuff to clean a motor. It seems most everyone points to using these more expensive cleaners that you have to order over the internet. If all these products are so great why are they not picked up by larger companies and marketed and put on the shelves in our retail stores. That is how every other product that is worth their salt is done. For example, the scunci steam cleaner was started marketed on tv. It went over well enough someone picked it up and started selling in the retail stores. All I seem to read is how bad the gunk stuff will break off large deposits which will get plugged in the oil passages. Ok??? Are you telling me that auto rx is going to magically break the same stuff apart and make it magically dissappear or dissolve? I cannot see how this stuff that cost 10 times as much is going to do anything different than the cheaper stuff that has been around for yrs and in the stores. I am not saying it will not work but I have to wonder why no one has marketed it and put in the stores. This is the same reason I will not buy amsoil. If it is so great and superior to royal purple, redline and others then why isn't it in our stores. How much garbage products do you see advertised on tv? Notice the good ones seem to make it to the retail market. Do yall think the internet is any different???