What does 5W-40 mean for car engine oil?
1 Answers
Engine oil "5W-40": The "W" stands for "winter", indicating it's for winter use. The number 5 before "W" represents the viscosity under low-temperature conditions. Below is a relevant introduction about the selection of engine oil grades: 1. German cars: Start with 0W40/5W40, although some 30-grade oils are also suitable for German cars. Small-displacement German cars can use 30-grade oils that meet viscosity requirements when new. 2. Domestic, American, Korean, and French cars: Generally use 0W30/5W30 within 60,000 kilometers, and switch to 0W40/5W40 after 100,000 kilometers. These four types of car engines have relatively consistent characteristics. The grade can be selected according to displacement: small-displacement (below 1.8L) can use 0W30 grade long-term, while large-displacement (above 2.0L) can switch to 0W40 grade earlier.