Lexus NX (EU)

Additional Notes

• The Lexus NX (EU) lineup covered here spans two hybrid variants, the NX 350h (AAZH25) and the NX 450h+ AWD (AAZH26), both introduced from 2021, and each carries two separate cooling circuits: one for the main cooling system and one dedicated to the inverter.
• The main cooling system on the NX 350h and NX 350h AWD holds between 6.2 and 7.5 liters, a range that reflects the difference between a service fill and a full drain-and-refill overhaul, where residual coolant in passages accounts for the lower figure.
• On the NX 450h+ AWD, the main cooling system capacity rises to 7.4-8.2 liters, a noticeably wider and higher range than the 6.2-7.5 liters specified for the NX 350h, consistent with the larger thermal load of a plug-in hybrid powertrain.
• The inverter cooling circuit on the NX 350h and NX 350h AWD holds 1.6-2 liters, while the same circuit on the NX 450h+ AWD is listed at a fixed 2 liters, indicating a smaller and more precisely defined circuit in the plug-in variant.
• All three variants share a 30,000 km check interval across both the main and inverter cooling systems, regardless of use condition.
• Under normal use conditions, both the main cooling system and the inverter circuit across all three variants carry a 90,000 km change interval.
• The first change only condition extends the main cooling system drain interval to 150,000 km across the NX 350h, NX 350h AWD, and NX 450h+ AWD, meaning the initial factory fill is treated as longer-lasting than subsequent fills.
• The inverter cooling circuit under the first change only condition carries a 240,000 km change interval across all three variants, a substantially longer interval than the 150,000 km applied to the main cooling system under the same condition, reflecting the more stable thermal environment of the inverter circuit.