Kia Optima, MS (USA / CAN)

Automatic transmission fluid capacity & service interval

Kia Optima, MS (USA / CAN) automatic transmission fluid capacity is 7,8 liters. Service intervals include checks at 5000 miles/5 months and 7500 miles/7 months, with fluid changes at 30000 miles/30 months and 105000 miles/105 months. The data covers 4 configurations.

The configuration chart below lists fill volumes and service intervals for each engine and trim variant.

TypeSpecifications
Optima 2.4 DOHC (USA) (2003-2006)
  • Use: Normal
  • Capacity 7,8 liter
  • Check 7500 miles/ 7 months
  • Change 105000 miles/ 105 months
  • Code: 4/1
Optima 2.4 DOHC (USA) (2003-2006)
  • Use: Severe
  • Capacity 7,8 liter
  • Check 5000 miles/ 5 months
  • Change 30000 miles/ 30 months
  • Code: 4/1
Optima 2.7 DOHC (USA) (2003-2006)
  • Use: Normal
  • Capacity 7,8 liter
  • Check 7500 miles/ 7 months
  • Change 105000 miles/ 105 months
  • Code: 4/1
Optima 2.7 DOHC (USA) (2003-2006)
  • Use: Severe
  • Capacity 7,8 liter
  • Check 5000 miles/ 5 months
  • Change 30000 miles/ 30 months
  • Code: 4/1

Additional Notes

  • The Kia Optima automatic transaxle fluid capacity is 7.8 liters across both the 2.4 DOHC and 2.7 DOHC engine configurations for 2003-2006, indicating a consistent transaxle unit shared between the two engine variants in the USA market.
  • A 7.8-liter fill volume is a relatively substantial capacity for an automatic transaxle, reflecting the total fluid volume the unit holds during a service fill.
  • Under normal use conditions, the 2.4 DOHC automatic transaxle fluid check interval is set at 7,500 miles or 7 months, whichever comes first.
  • The normal-use change interval for the 2.4 DOHC automatic transaxle extends to 105,000 miles or 105 months, a notably long service life reflecting low-stress operating assumptions under that condition.
  • Under severe use conditions, the 2.4 DOHC automatic transaxle fluid check interval shortens considerably to 5,000 miles or 5 months, compared to the 7,500-mile or 7-month normal-use interval.
  • The severe-use change interval for the 2.4 DOHC automatic transaxle drops to 30,000 miles or 30 months, representing roughly 28.6% of the 105,000-mile normal-use change interval.
  • The 2.7 DOHC automatic transaxle carries the same normal-use check interval of 7,500 miles or 7 months and the same change interval of 105,000 miles or 105 months as the 2.4 DOHC, despite the difference in engine displacement.
  • Under severe use conditions, the 2.7 DOHC automatic transaxle fluid change interval is 30,000 miles or 30 months, matching the severe-use interval specified for the 2.4 DOHC configuration across the same 2003-2006 model years.

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