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I've run primarily E85 and I've done changes at 3k miles and at 7k miles, all had considerable fuel wash and smelled strongly of ethanol. I haven't sent any oil samples for analysis, so it's purely anecdotal, but I change every 3k miles now because of that. My car gets beat the hell out of, and I enjoy fiddling with the car, so I don't mind the frequent oil changes. Whether it's necessary or not though, I can't answer that.
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"Sweet Subaru, sweet Subaru, send your BRZ unto me, for the roads of the unworthy must be baptized in speed and glory."
- The Ancient BRZ Sacrament by Zaku
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