What are the effects of switching from 5w30 to 0w30 on the engine?
2 Answers
Switching from 5w30 to 0w30 has no effect on the engine. Below are the specific details about 5w30 and 0w30 engine oils. Fluidity: 5w30 and 0w30 are oil grades, where 'w' stands for winter use. The number before 'w' represents the oil's fluidity—the smaller the number, the lower the oil viscosity, meaning better low-temperature fluidity. Viscosity: 0w30 has lower low-temperature viscosity and better low-temperature fluidity, making it suitable for colder temperatures, down to -35°C, whereas 5w30 performs slightly worse in low temperatures, with a minimum tolerance of only -30°C.
As an average driver, I noticed a significant difference in winter driving after switching from 5W30 to 0W30 motor oil. Previously, when starting the car in sub-zero temperatures (around -10°C), it would take over ten seconds to crank, accompanied by squealing engine noises. After switching to 0W30, the engine starts instantly with a single key turn – incredibly smooth. This is because 0W oil has lower viscosity in cold temperatures, flows more easily, and can quickly lubricate engine components, reducing wear during cold starts. After about a year of use, I've observed reduced engine noise and a slight fuel economy improvement (likely due to decreased friction). While 0W30 oil is slightly more expensive, I've calculated that spending an extra few dozen bucks annually for smoother starts and potential fuel savings is worthwhile. If you live in cold regions, I recommend trying it – just remember to check your owner's manual first to ensure compatibility with your engine. Long-term, this protects your vehicle's heart and avoids major repair costs.
