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Yes

In a modern car changing from regular to premium is no problem

It may have been costing you power and fuel mileage to run regular, but if your car does not need premium it is a waste of money.

On older cars running regular may damage the engine, but we are talking cars built in the 1980s or older.

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12y ago
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Q: Can you put supreme unleaded after you put regular unleaded in your car?
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