Acura RDX, TB3, TB4 (USA / CAN)
Coolant capacity & service interval
Acura RDX, TB3, TB4 (USA / CAN) models require coolant with a service fill capacity range of 6,6 to 7,4 liters. Service intervals include normal use and flexible use via an on board maintenance system. The data covers 4 configurations.
The configuration chart below lists fill volumes and service intervals for each engine and trim variant.
| Type | Specifications |
|---|---|
| RDX 3.5 i-VTEC V6 (2015-2018) |
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| RDX 3.5 i-VTEC V6 AWD (2015-2018) |
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| RDX 3.5 i-VTEC V6 (2012-2015) |
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| RDX 3.5 i-VTEC V6 AWD (2012-2015) |
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Additional Notes
- The Acura RDX TB3/TB4 3.5 i-VTEC V6 cooling system service fill capacity is listed at 6.6 liters for the 2012-2015 model years, applying equally to both front-wheel-drive and AWD configurations.
- A service fill value reflects the amount of coolant needed during a routine drain and refill, which is typically less than a full system overhaul capacity since residual fluid remains in the block and heater core passages.
- The 2015-2018 3.5 i-VTEC V6 variants, in both FWD and AWD configurations, carry a higher service fill capacity of 7.4 liters, representing an increase of 0.8 liters over the earlier generation.
- The 2012-2015 rows are assigned a normal use condition, meaning the service interval follows a fixed, time- or mileage-based schedule rather than an adaptive one.
- The 2015-2018 rows are assigned a flexible use condition tied to the on-board maintenance system, meaning the cooling service interval is determined dynamically by the vehicle's monitoring system rather than a predetermined fixed schedule.
- The AWD and FWD variants within the same generation share identical service fill capacities, indicating the drivetrain configuration does not affect the cooling system volume in either the 2012-2015 or 2015-2018 specifications.