2003 Pontiac Sunfire Logo
Posted on Nov 17, 2010
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What kind of auto trans fluid - 2003 Pontiac Sunfire

  • Denis Houle Jun 28, 2018

    Look in your owner's manual in specifications. You will find out.
    DexronII and DexronIII why the specification of the oil transmission is all related to additives and temperature of oil before it degraded.
    But I believe for 2003 Pontiac Sunfire is DexronIII.

    Hope it helps.

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Harvey N Tawatao

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  • Pontiac Master 3,854 Answers
  • Posted on Nov 17, 2010
Harvey N Tawatao
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The 2003 Sunfire has been updated from Dexron II or III to Dexron VI per a Technical Service Bulletin from GM.

Automatic Transmission, 4T40-E Initial Fill..........6.5 liters
Automatic Transmission, Total Fill 4 speed 4T40-E..........12.2 liters


Good luck and hope this helps, if you do use Synthetic transmission oil, make sure it's a Low Viscosity Synthetic Transmission oil. High viscosity transmission oil will cause the gear shifting to stick and will cause shifting issues.

Thank you for using fixya and good luck.

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