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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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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