Should I use 30 or 40 oil in summer?
2 Answers
In summer, 5W-40 engine oil provides better engine protection under high temperatures compared to 5W-30. Relevant information is as follows: 1. Different oil viscosity: 5W-40 has higher viscosity than 5W-30. 2. Different oil fluidity: 5W-40 has relatively poorer fluidity than 5W-30. 3. Different high-temperature resistance: 5W-40 offers better engine protection performance under high temperatures than 5W-30. 4. For good vehicle condition: The oil viscosity should be selected according to the recommended viscosity in the car maintenance manual. More expensive oil is not necessarily better; it should be chosen based on factors like weather conditions. For example, some mid-range cars may not require the most expensive oil.
This depends on your car's condition and usage environment. Last time I had maintenance, I chatted with the experienced mechanic, and he said most new cars nowadays are fine with 30 viscosity oil, especially those with turbochargers. 40 viscosity is like a thick down jacket for summer—it offers better high-temperature protection but increases fuel consumption by about half a liter. If your car has over 100,000 kilometers or you frequently drive long distances on mountain roads, 40 viscosity can better fill the engine gaps. However, you should always check your maintenance manual—the manufacturer's recommendation is the most reliable. My neighbor used 40 viscosity oil in his Japanese car without checking, and his fuel consumption skyrocketed.
