Kia Optima, MG (USA / CAN)

Coolant capacity & service interval

Kia Optima and MG (USA / CAN) models require coolant with a capacity range of 6,4 to 8,3 liters. Service intervals consist of 30000 miles or 24 months and 60000 miles or 60 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 6,4-6,9 liter
  • Change 30000 miles/ 24 months
Optima 2.4 DOHC (USA) (2008-2010)
  • Use: First change only
  • Capacity 6,4-6,9 liter
  • Change 60000 miles/ 60 months
Optima 2.7 V6 (USA) (2008-2010)
  • Use: Normal
  • Capacity 8,2-8,3 liter
  • Change 30000 miles/ 24 months
Optima 2.7 V6 (USA) (2008-2010)
  • Use: First change only
  • Capacity 8,2-8,3 liter
  • Change 60000 miles/ 60 months
Optima 2.4 DOHC (USA) (2006-2008)
  • Use: Normal
  • Capacity 6,4-6,9 liter
  • Change 30000 miles/ 24 months
Optima 2.4 DOHC (USA) (2006-2008)
  • Use: First change only
  • Capacity 6,4-6,9 liter
  • Change 60000 miles/ 60 months
Optima 2.7 V6 (USA) (2006-2008)
  • Use: Normal
  • Capacity 8,2-8,3 liter
  • Change 30000 miles/ 24 months
Optima 2.7 V6 (USA) (2006-2008)
  • Use: First change only
  • Capacity 8,2-8,3 liter
  • Change 60000 miles/ 60 months

Additional Notes

  • The Kia Optima 2.4 DOHC (USA) cooling system holds 6.4-6.9 liters, a capacity range that reflects minor variation between service fill and full system drain conditions across the 2006-2010 model years.
  • The 2.7 V6 (USA) configuration carries a noticeably larger cooling system capacity of 8.2-8.3 liters, compared to 6.4-6.9 liters on the 2.4 DOHC, which corresponds directly to the greater displacement and additional cylinder count of the V6 engine.
  • Under normal use conditions, both the 2.4 DOHC and 2.7 V6 share a coolant change interval of 30,000 miles or 24 months across the full 2006-2010 span covered in the specifications.
  • A separate first change only interval of 60,000 miles or 60 months applies to both engine configurations for 2006-2010, meaning the initial factory-fill coolant is specified to last significantly longer before the first scheduled replacement than subsequent normal-interval changes.
  • The 60-month first change only interval is exactly 2.5 times the 24-month normal interval, indicating that the factory coolant formulation is treated as having a substantially longer service life than the fluid used in routine subsequent fills.
  • Capacity figures for both the 2.4 DOHC and 2.7 V6 remain unchanged between the 2006-2008 and 2008-2010 sub-ranges, suggesting no cooling system volume changes were introduced at the 2008 model year boundary for either engine.
  • The overlapping 2008 model year appears in both the 2006-2008 and 2008-2010 sub-ranges for each engine, with identical capacities and intervals recorded in both entries, indicating consistent specifications at that transition point.

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