Lexus ES, XZ10 (EU)

Additional Notes

• The Lexus ES 300h (AXZH10) carries two separate cooling circuits: the main engine cooling system and a dedicated inverter cooling system, each with its own capacity and change interval specifications.
• The main cooling system holds between 6.1 and 6.7 liters across all covered model years from 2018-2021, a range that reflects normal variation during a service fill rather than a full overhaul drain.
• The inverter cooling system capacity is listed at 1.8-2.0 liters across the same 2018-2021 model year span, a notably smaller volume consistent with the compact thermal management loop used to regulate power electronics in hybrid drivetrains.
• For the main cooling system under normal use conditions, the change interval is set at 90,000 km or 72 months, while checks are scheduled every 30,000 km or 24 months throughout the 2018-2021 range.
• Under the first change only condition, the main cooling system change interval extends significantly to 150,000 km or 120 months, applying uniformly across all covered model years from 2018-2021. A first change only designation typically means the factory-fill coolant is formulated to last longer before the initial drain, after which the standard normal-use interval governs subsequent changes.
• The inverter cooling system under normal use conditions shares the same 90,000 km or 72-month change interval as the main cooling system, with checks also aligned at 30,000 km or 24 months for all covered years.
• Under the first change only condition, the inverter cooling system change interval reaches 240,000 km or 192 months for the 2018-2020 model years, a substantially longer service life than the main cooling system's first-change interval of 150,000 km or 120 months.
• For the 2021 model year, the inverter cooling system first change only interval is listed as 240,000 km without a corresponding month value, whereas earlier model years carry both a kilometer and a month figure of 192 months for the same condition.