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No, I don't think that Synthetic would address the problem. I don't think turbo problems were the issue. My WRX and others were showing increased wear due to damage to the oil from fuel dilution. Even GC was not able to stand up to that. The best course of action is to change the oil out sooner.
Ed
That sounds reasonable to me. For the Turbos to have such poor fuel economy compared to the NA and it being the same engine, it sure sounds like fuel dilution is a big issue.