2026-09-15
Lexus IS 250/300h/350 Coolant Flush & Replacement Malaysia
Use Toyota Super Long Life Coolant (SLLC, pink) for the IS 250/350; flush every 40,000 km or 2 years. The IS 300h requires two separate coolant circuits — engine coolant (SLLC) plus inverter coolant (blue, Toyota Genuine), renewed at 100,000 km or 10 years. Mixing coolant types degrades corrosion protection and can damage the inverter.
IS Coolant Service
- Coolant: Toyota Super Long Life Coolant (SLLC) pink — first change at 160,000 km, then every 80,000 km
- Do NOT mix pink SLLC with green conventional coolant — different inhibitor chemistry
- In Malaysia's heat: check coolant level monthly — watch for coolant loss which may indicate head gasket issues