Which provides better performance, 0W30 or 5W30?

[DiDelilah]

When comparing 0W30 and 5W30 engine oils based solely on their viscosity index ratings, 0W30 generally offers better performance. It has superior low-temperature fluidity and better cold resistance. While 5W-30 is typically suitable for all seasons, 0W30 performs particularly well in winter conditions. In terms of price, 0W30 is more expensive and is usually fully synthetic. The "W" stands for winter, and the number preceding it indicates the oil's fluidity and the minimum applicable temperature. 0W means good fluidity at -35°C, while 5W represents good fluidity at -30°C. Therefore, a smaller number before the "W" indicates lower viscosity index and better low-temperature fluidity.