Acura RL, KA9, KB1, KB2 (USA / CAN)

Additional Notes

• The dry fill capacity of 8.6 liters on the Acura RL 3.5 (2001-2004) represents the total volume of the cooling system when completely empty, as would be the case during a full engine overhaul or replacement where all coolant has been drained from every passage, reservoir, and component.
• The service fill capacity of 6.1 liters on the RL 3.5 (2001-2004) is notably lower than the dry fill figure, reflecting the volume of coolant that remains trapped in the engine block, heater core, and other components during a standard drain-and-refill procedure.
• Under normal use conditions, the RL 3.5 (CAN) (2001-2004) cooling system carries a change interval of 96,000 km or 60 months, while the first change only condition extends that interval to 192,000 km or 120 months, indicating that the initial factory fill of coolant is rated for a significantly longer service life before the first replacement.
• The same dual-interval structure applies to the RL 3.5 (USA) (2001-2004), with a normal change interval of 96,000 km or 60 months and a first change only interval of 192,000 km or 120 months, matching the Canadian market specification exactly.
• The RL 3.5 (USA) (2005-2008) shows a slight reduction in dry fill capacity to 8.3 liters compared to the 8.6 liters of the 2001-2004 model, while the service fill capacity increases marginally to 6.3 liters, suggesting a modest change in cooling system architecture between generations.
• The RL 3.7 SH-AWD (USA) covering 2009-2011 and 2011-2012 shares identical capacity figures of 8.6 liters dry fill and 6.0 liters service fill, returning to the same dry fill volume seen in the 2001-2004 3.5-liter configuration despite the larger displacement and all-wheel-drive drivetrain.
• Across the 3.7 SH-AWD entries, the service fill capacity of 6.0 liters is the lowest among all configurations listed, meaning a routine coolant service on those models requires less fluid volume than either the 2001-2004 or 2005-2008 3.5-liter variants.