Over the weekend I worked at a houshold hazardous waste collection. People bring all kinds of chemicals, including used oil. For some reason people bring un-used oil, so I keep that for my own use. One oil that was brought in was sorta interesting to me. It's was in an oil can, not a plastic bottle, and actual cylinder type metal can. It's Mobil One 100% synthetic, and on the back it states 25,000 mile oil changes (or 1 year which ever comes first). I found in interesting as I never knew Mobil 1 made this claim. I have no idea how old it is. I'm 29, and the cans were before my oil changing time. Anyone know as to when Oil companies stopped putting it in cans? The same guy also had two quarts of the same Mobil 1, in round plastic bottles, same claims where on these oil bottles too. I might take a couple pics of it if anyone is interested.