I ran Arco Graphite in my '84 CJ-7 for an oil change or two, in Fairbanks, AK. That Jeep leaked oil through practically every joint in the long block--whether that was due to the Arco Graphite, or the -40F ambient temps (hey, it had a battery blanket, and a block heater), only God knows. I moved on from there to other junk additives, like Tuf-Oil and Slick 50, before throwing in the towel on turning my vehicles into perpetual motion machines.