I run E85 100% of the time...and have been for the last 50,000+ miles. If anybody would like to pitch in for a UOA, I would be more than happy to run one. I change the oil once every six months, paying zero attention to miles. I do roughly 15,000 a year, so you can do the math. Engine currently has right about 98,000 miles. 5w-30 PP in the winter and 5w-40 in the summer.