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Ethanol is a solvent and will react with some plastics. Cars made in the 70s and before weren't designed with ethanol in mind and so it's use may cause damage to fuel lines and seals. It also absorbs moisture more easily, so if it sits in a gas tank for a long time, it can encourage the formation of rust.
All modern cars are designed with ethanol-safe materials. There's no risk of damage to your Boxster directly related to using 10% ethanol in your gasoline. It will lower gas mileage, though, due to it's lower energy content.
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