What is the difference between 5w20 and 0w20?

2 Answers
VanSerenity
07/28/25 6:10pm
0w20 has better low-temperature fluidity and cold resistance compared to 5w20. The 'W' stands for winter, indicating its use in winter conditions. The smaller the preceding number, the better the oil's fluidity in low-temperature environments. The number '20' represents the oil's viscosity at 100°C, with higher numbers indicating higher viscosity and better high-temperature resistance. Below is relevant information about engine oil: Introduction: Engine oil, also known as engine lubricant (English name: Engine-oil), with a density of approximately 0.91×10³ (kg/m³), serves functions such as lubrication and wear reduction, auxiliary cooling, sealing and leak prevention, rust and corrosion protection, and shock absorption. It is often referred to as the 'blood' of a car. Composition: Engine oil consists of two main components: base oil and additives. The base oil is the primary component of lubricants, determining their fundamental properties, while additives compensate for and enhance the base oil's performance deficiencies, imparting new characteristics. Additives are an essential part of lubricants.
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StJade
08/11/25 11:59pm
I live in the cold northern region where winter temperatures often drop below minus ten degrees Celsius. When I used 5W-20 oil before, the engine would chug and groan for a while during cold starts in the morning, feeling sluggish to lubricate. After switching to 0W-20, the engine starts much smoother now, with reduced noise and better engine protection. This is because the number before the 'W' indicates low-temperature viscosity – 5 means it flows slightly slower in cold conditions, while 0 represents thinner, more fluid oil that can quickly coat engine components in freezing weather, reducing wear risks. 0W-20 performs significantly better in harsh winters, though the difference is minimal in warmer regions. I recommend friends in cold climates prioritize this oil grade to extend engine life. Always check your vehicle manual for recommended oil specifications and avoid arbitrary oil changes. This small adjustment makes driving noticeably more pleasant.
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