Honda Civic IX, FB/FG/FK (USA / CAN)

Additional Notes

• The Honda Civic IX FB/FG/FK cooling system capacities across the 2011-2015 model range fall within a relatively narrow band, spanning from 5.18 liters on the Hybrid FB4 up to 5.6 liters on the standard 1.8 FB variants.
• The 5.6-liter figure listed for the Civic 1.8 FB is designated as a service fill capacity, meaning the value reflects the amount of coolant added during a fluid service rather than the total system volume measured during a full overhaul or dry fill.
• The Civic Si 2.4 FB6/FG4 shares the same 5.5-liter service fill designation as the GX 1.8 CNG, despite the Si using a larger displacement 2.4-liter engine compared to the 1.8-liter found in the CNG variant.
• The Civic GX 1.8 CNG (2011-2015) carries a 5.5-liter capacity without an explicit service fill label in the specifications, distinguishing the way the figure is presented from the labeled service fill values on the 1.8 FB and Si 2.4 entries.
• The Civic Hybrid FB4 records the lowest cooling system capacity in the lineup at 5.18 liters, a figure that reflects the different thermal management demands associated with a hybrid powertrain configuration.
• All five configurations across the 2011-2015 range operate on a flexible service interval governed by an on-board maintenance system, meaning coolant service timing is determined by the vehicle's monitoring system rather than a fixed mileage or time schedule.
• The Civic 1.8 FB appears across two overlapping specification rows, one covering 2011-2014 and another covering 2014-2015, both recording an identical 5.6-liter service fill capacity with the same flexible interval condition.