Should the Reiz use 5w40 or 5w30?
2 Answers
The suitable gasoline for the Reiz can be determined based on different scenarios: 1. If you don't frequently drive on highways, the Reiz can use fully synthetic oil 5w30; 2. If you frequently drive on highways, using fully synthetic oil 5w40 is better. The following are the differences between 5w30 and 5w40: 1. Different high-temperature stability: The number after 'W' indicates the kinematic viscosity of the engine oil at 100°C. A larger number means higher viscosity, which means better protection and stability under high temperatures, i.e., 5w40 is more stable than 5w30 at high temperatures. 2. Different usage targets: 5w40 has better viscosity than 5w30, making it more suitable for older cars. 5w30 is more effective in reducing fuel consumption, allowing the engine to dissipate heat faster and better, with lower noise, making it suitable for new cars or naturally aspirated engines. 3. Different fluidity: 5w30 has better fluidity than 5w40, which can further reduce fuel consumption and allow the engine to dissipate heat faster.
I've been driving a Reiz for several years, and the V6 engine is indeed a bit picky about oil. When the car was new, the manual specified 5W30, which made for quick starts in winter and better fuel efficiency. However, after seven or eight years, I noticed oil leakage issues, so I switched to 5W40 for thicker engine protection. Southern summers are extremely hot, and 5W40 holds up well on the highway, even reducing engine noise. Still, with an older car, don’t just pick any oil—check the manual or consult the dealership first to avoid improper viscosity accelerating wear. Regular oil changes every 5,000 km are a must; otherwise, insufficient lubrication can damage internal parts, leading to costly repairs and downtime.
