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Does premium fuel do any harm to a 2000 Oldsmobile Alero?

No, using premium fuel in a 2000 Oldsmobile Alero won't cause any harm. The Alero's engine is designed to run on regular unleaded gasoline. Premium fuel has a higher octane rating, meaning it's less prone to pre-ignition (knocking). While it won't hurt the engine, it's unnecessary and you'll be paying more for no performance gain. The engine's computer will simply adjust to the higher octane fuel. You won't see any noticeable improvement in power or fuel economy.
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