2026-09-15
Lexus IS 300h Hybrid System – How It Works & Maintenance Malaysia
The IS 300h uses Toyota Hybrid System II (THS II) with a 2AR-FXE 2.5L Atkinson-cycle engine, MG1/MG2 motor generators, and a nickel-metal hydride (NiMH) high-voltage battery. The eCVT provides seamless power delivery with no traditional gear changes. Key maintenance: inverter coolant every 100,000 km, 12V aux battery every 4–6 years, and no additional hybrid-specific oil — same 0W-20 as a conventional engine.
IS 300h Hybrid System
- IS 300h uses Toyota 4th-gen hybrid: 2AR-FXE Atkinson + MG1/MG2 motor-generators + P310 NiMH HV battery + eCVT
- 12V auxiliary battery: replace every 3 years — most common failure point
- HV NiMH battery: reliable to 200,000 km with normal driving — scan health at 100,000 km
- Inverter coolant: change at 160,000 km or 10 years