Should Changan Eado use 5W30 or 5W40 engine oil?

[Edith]

Both viscosity grades are suitable, with the main difference being viscosity - 40 has higher viscosity. If you mainly drive in the city, 5W30 engine oil is sufficient; for highway driving or aggressive driving style, you may choose 5W40. Here's a brief introduction about Changan Eado: Basic information: Eado is a global strategic model developed by Changan Automobile's global R&D team over three years, representing an internationally advanced mid-size sedan at the highest global level. Design style: Featuring minimalist overall design that sets a benchmark, it combines European style fashion with international trendy elements, achieving perfect integration of aesthetics and exquisite craftsmanship. With sharp lines as the main theme, it incorporates dynamism and fashion into every detail.

[DiPaul]

I've been driving the Changan Eado for over two years, mainly for city commuting. Since the first maintenance, I've been using 5W30 engine oil. This viscosity has good fluidity, especially for quick cold starts in winter, and the fuel consumption is about 0.5 lower than 40. Once, a maintenance technician said that older cars with over 80,000 kilometers could switch to 5W40 to slow down oil burning. However, with the high precision of modern engines in new cars, there's no need to use 40 viscosity at all. My younger brother, who drives the same model but prefers heavy throttle and often drives on highways, was also advised by the 4S dealership to use 5W30. The manual clearly recommends 30 viscosity, so I think it's better not to overcomplicate things—regular maintenance is more important than obsessing over oil grades.

[SilasLee]

From the perspective of oil parameters, the main difference between 5W30 and 40 lies in high-temperature viscosity. The Blue Whale engine in the Eado has small clearances, where 30 viscosity forms a stable oil film while reducing internal resistance. I've tested oil pressure - with 30 viscosity, oil reaches the cylinder head 0.5 seconds faster during cold starts compared to 40. For areas with year-round temperatures above 35°C or vehicles over five years old, 40's high-temperature shear value provides better protection for aging engines. However, using 40 viscosity in northern winters may actually increase wear, with the dashboard oil light staying on longer during morning starts. New owners should simply follow the manual's recommendation of SL-grade 5W30 full synthetic oil. Considering switching to 40 viscosity can wait until 150,000 kilometers.

[ZaneLynn]

Just serviced a 2023 EADO yesterday and specifically checked the maintenance manual confirming 5W30 is recommended. Changan designed this powertrain for 30 viscosity, especially with frequent auto start-stop operation where lower viscosity oil pumps faster. Encountered a customer insisting on 5W40, claiming friends recommended better wear protection, but this actually just increases fuel consumption and cold-start wear. For older EADO models frequently hauling loads on mountain roads, using 40 viscosity could be discussed. Don't arbitrarily change grades during new car warranty period - our shop has used 5W30 factory oil for over 3 years with near-zero comeback rate.