Lexus IS, XE30 (EU)

Additional Notes

• The Lexus IS 250, USE30 carries the largest main cooling system capacity across the lineup at 10.5 liters, which reflects the greater coolant volume associated with a larger displacement V6 engine compared to the four-cylinder turbocharged variants.
• The IS 200t and IS 300, both on the ASE30 platform, share an identical main cooling system capacity range of 7.8-7.9 liters alongside a separate 3-liter intercooler circuit, meaning two distinct coolant volumes must be accounted for during a full service on turbocharged ASE30 models.
• The IS 300h, AVE30 splits coolant service into two independent circuits: an 8.2-liter main cooling system and a 2-2.2 liter inverter cooling circuit, the latter being dedicated to managing heat generated by the hybrid power electronics.
• Across all variants, the check interval is set at 30,000 km regardless of engine type or use condition, while change intervals diverge significantly depending on whether the fill is treated as a normal service or a first change only.
• Under normal use conditions, all variants specify a coolant change interval of 90,000 km, whereas the first change only condition extends the main cooling system change interval to 150,000 km, indicating the factory-fill coolant is formulated to last longer before the first drain.
• The inverter cooling circuit on the IS 300h, AVE30 carries a first change only interval of 240,000 km, which is considerably longer than the 150,000 km first change interval applied to the main cooling system on the same vehicle, reflecting a different coolant specification or degradation rate for the inverter circuit.
• The IS 300h, AVE30 appears across two separate year groupings, 2013-2019 and 2019-2020, with identical capacity and interval figures in both, meaning no specification change is recorded between those production periods for either the main or inverter cooling circuits.
• The IS 200t, ASE30 covers model years 2015-2017, while the IS 300, ASE30 covers 2017-2018, yet both share the same 7.8-7.9 liter main capacity, 3-liter intercooler capacity, and identical check and change intervals under both normal and first change only conditions.