Acura MDX, YD3, YD4 (USA / CAN)

Additional Notes

• The Acura MDX 3.0 Sport Hybrid carries two separate cooling circuits: one for the main engine with a total capacity of 7.68 liters, and a dedicated inverter cooling circuit with a total capacity of 1.67 liters. The inverter circuit also includes a 0.41-liter expansion tank, which is a small reservoir that accommodates fluid volume changes as the system heats and cools.
• The 7.68-liter main cooling system capacity on the MDX 3.0 Sport Hybrid is expressed as a total fill figure rather than a service fill. Total capacity typically reflects the full volume of the system including all passages, the radiator, and the reservoir, as opposed to a service fill, which represents the amount of fluid added during a standard drain-and-refill procedure.
• The MDX 3.5 V6 and MDX 3.5 V6 SH-AWD for 2013-2015 list a service fill capacity of 7.3 liters under normal use conditions. A service fill value indicates the quantity of coolant required when draining and refilling without a full system flush, meaning some residual fluid remains in the block and heater core passages.
• From 2016-2020, the MDX 3.5 V6 in both CAN and USA markets lists a service fill range of 7.3-7.4 liters rather than a fixed value. A capacity range of this kind typically reflects minor variation between production builds or trim configurations within the same engine family.
• The MDX 3.5 V6 SH-AWD for 2016-2020 in both CAN and USA markets specifies a fixed service fill of 7.4 liters, sitting at the upper end of the 7.3-7.4-liter range listed for the standard MDX 3.5 V6 in the same years. The SH-AWD (Super Handling All-Wheel Drive) system adds mechanical components that can influence underhood thermal management, which may account for the slightly higher fixed value.
• The shift from a fixed 7.3-liter service fill in 2013-2015 to a 7.3-7.4-liter range in 2016-2020 for the MDX 3.5 V6 coincides with the change from a normal use condition to a flexible interval governed by the on-board maintenance system. The on-board maintenance system monitors driving conditions and calculates service intervals dynamically rather than applying a fixed mileage or time schedule.
• All 2017-2020 MDX 3.0 Sport Hybrid and all 2016-2020 MDX 3.5 V6 configurations across both CAN and USA markets use the flexible on-board maintenance system interval, while the 2013-2015 MDX 3.5 V6 and MDX 3.5 V6 SH-AWD are serviced under normal use conditions. Normal use conditions in coolant service typically correspond to a fixed calendar or mileage interval rather than a condition-based calculation.
• The CAN and USA market specifications for the MDX 3.0 Sport Hybrid (2017-2020) are identical across both cooling circuits, with 7.68 liters for the main system and 1.67 liters total for the inverter circuit. The same alignment appears for the MDX 3.5 V6 and MDX 3.5 V6 SH-AWD in 2016-2020, where CAN and USA figures match in both capacity and use condition.