2026-07-21 · 4 min read
Toyota Prius Coolant Malaysia
Toyota Prius Coolant guide and repair information for Malaysia owners.
Prius has two cooling circuits — engine coolant and inverter coolant. Both use Toyota SLLC (pink OAT). Change every 4 years. Never let the inverter coolant run low — inverter overheating causes system shutdown and expensive repairs.
Coolant Service
- Engine coolant flush
- Inverter coolant flush (separate circuit, separate reservoir)
- Do both at same service for convenience — use Toyota SLLC for both circuits