What does 5w40 mean on engine oil?
1 Answers
The "5W-40" on engine oil, the "W" stands for "winter", meaning it is for winter use. The number 5 before the "W" represents the viscosity under low-temperature conditions. Here is a related introduction about the selection of engine oil grades: 1. German cars: Start with 0W40/5W40, but some 30-grade oils are also suitable for German cars. Small-displacement German cars can use 30-grade oils that meet the 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 based on the displacement. Small-displacement cars (below 1.8L) can use 0W30 grade for a long time, while large-displacement cars (above 2.0L) can switch to 0W40 grade earlier.