The Difference Between Edge 5w40 and 5w30?

[DiAdelyn]

Here are the specific differences between Edge 5w30 and 5w40: 1. Stability at high temperatures: The numbers 40 and 30 after 5w represent viscosity, with higher numbers indicating greater viscosity and suitability for higher maximum temperatures. This means that 5w40 can adapt to higher temperature environments compared to 5w30, and high-viscosity oil (with a higher value) may also be more suitable for high-speed driving or heavy-duty vehicles. 2. Viscosity: 5W30 oil has a slightly lower viscosity than 5W40 oil, making it more suitable for new cars and new engines. 5W40 oil has higher viscosity, making it suitable for older cars as it can enhance sealing and prevent oil burning.

[DiDylan]

I recently switched between Castrol Edge 5w30 and 5w40 oils and found the main difference lies in high-temperature protection. The 5w30 is thinner, starts up exceptionally fast, and is ideal for daily commuting and fuel efficiency – my car fires up instantly in the mornings with slightly lower fuel consumption. However, 5w40 offers superior protection under high temperatures; during long-distance or highway driving, the engine resists overheating better, and its higher viscosity reduces wear. My advice: choose based on driving habits – 30-grade suffices for regular city use, while 40-grade suits aggressive driving or mountainous terrain. Never ignore the vehicle manual's recommendations; misuse may compromise engine longevity. Regular oil changes remain paramount.