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The 86's do not show as high as percentage of fuel contamination, generally speaking, as the turbocharged FA20 engine in the new Foresters (check the long uoa thread in this forum). The Forester example that I linked shows 6% fuel in only 1,200 miles of driving. The Lubrizol pdf does discuss turbo and NA DI engines.
No, oil consumption and fuel contamination do not necessarily go hand in hand. You could have both, but not always. Ring design is blamed on that oil consumption problem because SoA has a TSB about it.
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