Kia Optima, MG (USA / CAN)

Automatic transmission fluid capacity & service interval

Kia Optima and MG (USA / CAN) models utilize automatic transmission fluid with a capacity range of 7,8 to 9,5 liters. Service intervals include checks at 9000 miles or 9 months and 15000 miles or 12 months, with fluid changes at 18000 miles or 18 months, 30000 miles, and 105000 miles or 84 months. The data covers 8 configurations.

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

TypeSpecifications
Optima 2.4 DOHC (USA) (2008-2010)
  • Use: Normal
  • Capacity 7,8 liter
  • Check 15000 miles/ 12 months
  • Change 105000 miles/ 84 months
  • Code: 5/1
Optima 2.4 DOHC (USA) (2008-2010)
  • Use: Severe
  • Capacity 7,8 liter
  • Check 15000 miles/ 12 months
  • Change 30000 miles
  • Code: 5/1
Optima 2.7 V6 (USA) (2008-2010)
  • Use: Normal
  • Capacity 9,5 liter
  • Check 15000 miles/ 12 months
  • Change 105000 miles/ 84 months
  • Code: 5/1
Optima 2.7 V6 (USA) (2008-2010)
  • Use: Severe
  • Capacity 9,5 liter
  • Check 15000 miles/ 12 months
  • Change 30000 miles
  • Code: 5/1
Optima 2.4 DOHC (USA) (2006-2008)
  • Use: Normal
  • Capacity 7,8 liter
  • Check 15000 miles/ 12 months
  • Code: 5/1
Optima 2.4 DOHC (USA) (2006-2008)
  • Use: Severe
  • Capacity 7,8 liter
  • Check 9000 miles/ 9 months
  • Change 18000 miles/ 18 months
  • Code: 5/1
Optima 2.7 V6 (USA) (2006-2008)
  • Use: Normal
  • Capacity 9,5 liter
  • Check 15000 miles/ 12 months
  • Code: 5/1
Optima 2.7 V6 (USA) (2006-2008)
  • Use: Severe
  • Capacity 9,5 liter
  • Check 9000 miles/ 9 months
  • Change 18000 miles/ 18 months
  • Code: 5/1

Additional Notes

  • The Kia Optima 2.4 DOHC automatic transaxle carries a fluid capacity of 7.8 liters, a figure that reflects a full system fill rather than a partial drain-and-refill service quantity.
  • The 2.7 V6 automatic transaxle holds 9.5 liters, which is notably higher than the 7.8-liter capacity of the 2.4 DOHC, reflecting the larger transmission unit paired with the six-cylinder engine.
  • For the 2.4 DOHC in 2006-2008, no fluid change interval is listed under normal use conditions, only a check at 15,000 miles or 12 months, whereas severe use adds a change interval of 18,000 miles or 18 months.
  • The same pattern applies to the 2.7 V6 in 2006-2008, where normal use specifies only a check at 15,000 miles or 12 months, and severe use introduces a change at 18,000 miles or 18 months alongside a more frequent check at 9,000 miles or 9 months.
  • Starting with the 2008-2010 model years, both the 2.4 DOHC and 2.7 V6 under normal use gain a defined change interval of 105,000 miles or 84 months, a significant departure from the 2006-2008 normal-use specifications that carried no change interval at all.
  • Under severe use for 2008-2010, both engine configurations share a change interval of 30,000 miles with no month-based equivalent stated, contrasting with the 2006-2008 severe-use interval that expressed the change in both miles and months.
  • The check interval under severe use shifts between the two production periods. In 2006-2008, severe use called for a check every 9,000 miles or 9 months, while in 2008-2010 severe use aligns with the normal-use check schedule of 15,000 miles or 12 months.
  • Across all four configurations and both use conditions, the fluid capacity values remain constant within each engine type regardless of model year, meaning the 7.8-liter and 9.5-liter figures are stable across the 2006-2010 span covered by these specifications.

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