USING REGULAR GRADE GAS IN A PREMIUM GAS CAR

  • Tiny
  • onthewayhome
  • 2001 Pontiac Bonneville
  • 60,000 miles

About a year after buying this 2001 Pontiac Bonneville SSEI - fuel injected V6 that uses premium fuel I weaned it for about 6 months by gradually mixing 1/2 premium with 1/2 tank mid-grade then mid-grade with regular. I assumed that this would reset the computer to accept regular instead of premium. Since 2002 and about 50,000 miles later I have not had any problems and no knocking or pinging. I have read that this will cause engine damage. Please tell me if this will damage the engine and what should I do to prevent any damage. Thanks, Bob

Monday, February 13th, 2012 AT 7:24 PM

1 Answer

  • Tiny
  • fixitmr
  • Member

If it's workin ok then have at it! I have not personally run into any ruined engines because of this.

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Monday, February 13th, 2012 AT 9:11 PM

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