Honda Civic III, AG/AH/AK/AN (USA / CAN)

Coolant capacity & service interval

Honda Civic III, AG/AH/AK/AN (USA / CAN) coolant capacity ranges from 4,9 to 5,5 liters. Service intervals include 30000 miles/ 24 months, 30000 miles/ 30 months, and 45000 miles/ 45 months. The data covers 6 configurations.

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

TypeSpecifications
Civic III Si (1985-1987)
  • Use: Normal
  • Capacity 5,2-5,5 liter
  • Change 30000 miles/ 24 months
Civic III Si (1985-1987)
  • Use: First change only
  • Capacity 5,2-5,5 liter
  • Check 30000 miles/ 30 months
  • Change 45000 miles/ 45 months
Civic III 1300 (1984-1987)
  • Use: Normal
  • Capacity 4,9-5,2 liter
  • Change 30000 miles/ 24 months
Civic III 1300 (1984-1987)
  • Use: First change only
  • Capacity 4,9-5,2 liter
  • Check 30000 miles/ 30 months
  • Change 45000 miles/ 45 months
Civic III DX, S (1984-1987)
  • Use: Normal
  • Capacity 5,2-5,5 liter
  • Change 30000 miles/ 24 months
Civic III DX, S (1984-1987)
  • Use: First change only
  • Capacity 5,2-5,5 liter
  • Check 30000 miles/ 30 months
  • Change 45000 miles/ 45 months

Additional Notes

  • The Honda Civic III AG/AH/AK/AN cooling system capacity varies by trim level, with the 1300 requiring 4.9-5.2 liters and the DX, S, and Si trims each requiring a slightly larger 5.2-5.5 liters.
  • The capacity figures given as ranges rather than fixed values reflect the difference between a partial service fill and a full system overhaul, where the lower end typically represents a drain-and-refill and the upper end accounts for a completely dry system.
  • Under normal use conditions, all three trim configurations share the same coolant change interval of 30,000 miles or 24 months, whichever comes first.
  • A separate first-change-only schedule applies across all trims, extending the initial coolant change interval to 45,000 miles or 45 months, with a check point at 30,000 miles or 30 months.
  • The extended first-change-only interval reflects a common factory practice of using a higher-grade initial coolant fill that is rated to last longer before the first service, after which the standard normal-use schedule takes over.
  • The Civic III Si trim carries a 1985-1987 production window, two years shorter than the 1984-1987 range of the 1300 and DX, S trims, yet shares the identical cooling system capacity and service intervals as the DX and S variants.
  • The 0.3-liter difference in cooling system capacity between the 1300 and the DX, S, and Si trims corresponds to the larger displacement engines fitted to the higher trims, which generate more heat and require a proportionally larger coolant volume.

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