G-Man II, I was taught that the base stock in the bottle is good almost indefinately. The additves on the other hand can last anywhere from two-four years before any breakdown in them becomes significant enough to worry about. This info is a bit out dated. My chemistry prof. in H.S. retired from Mobil before takeing up teaching. This was back in the late 80's. So I am sure things have changed with additives. It would appear thought that we all agree that 2 years is fine.
Make sure you go to the Auto-Rx site and follow direction exactly. If you do not and you post anything that is not absolutely glowing you will be publicly drawn and quatered! I made the mistake of putting fresh oil in by misunderstanding and was cruxified for it! So just a friendly warning!! Following the directions for your application!!
When I did my application the oil for the first treatment was to be the old used dirty oil already in the engine. If you added new oil then you had to put at least 1500 miles on it before adding the AUto-Rx.Things might of changed but I would still check the Auto-Rx site. The last thing you need is for the Auto-Rx cult to make life difficult for you when you post anything about your experinces and observations!!
For the record I like the product. I just think that it is insane that no one can report anything but glowing reviews without being abused for it. We do not see this type of behavior with any other product. Someone can make any coment they want about Lube Control,132,131,B-12, Oil Extreme..... and no matter how bad the remark is it does not generate public 5 pages of posts. No one comes out of the word work to redicule of demoralize the person that posted the remarks. On the other hand if you say anything that is not absolutely positive about Auto-Rx you will be attacked in droves.