Y'all had me thinking about back tracking on the E-85, I did some reading and apparently there's conflicting information about what it does or doesn't do. Apparently, which I should have known, it is a strong cleaner more so than regular gas. Conflicting reports suggest it may corrode certain metals, fuel lines, gaskets, ect. Some say it does, some say it doesn't. Other reports say it is too hard on moving parts that require lubrication such as diesel components, but this is running it with nothing but E-85. I'm not worried about mixing it with oil, but the fact it could deteriorate seals, lines, ect, that's enough to make me think twice about using it. It may or may not damage my truck, but saving a few bucks isn't worth a new IP, not imo.