I know we've discussed the shelf life of oil here in the past, and that it's about 4-5 years, but I'm wondering what exactly happens to the oil as it gets that old? And what about oil that has been sitting around for 2 or 3 years, does it begin to show signs of degradation compared to when it was freshly packaged? I think with the number of us on here who are storing a lot of oil, this is something of concern. I can't help but wonder if the oil that I'm saving will be just as good in two years as it is right now. Would older oil not be able to handle longer drains for instance?