any ester based oils are no good for e85
its not the moisture that is the issue, a byproduct of burning ethanol breaks down the oil molecular structure. "hydrocracked" synthetics are "more" suitable,
something about the ethanol structure wich is close to the chemiclas used to make/blend the oil, so it starts being "unmade" if that makes sense. straight from our motul rep, liquimoly rep and penrite rep.
would be worth asking holden what they use for there flex fuel commo..
as far as oils go, penrite syn 15 is my oil of choice. 15w50