0W30 has a lower viscosity than other types and will flow more freely in extremely cold weather -22℉ (-30℃) or lower. Standing in the middle of this comparison, 5W30 has a higher viscosity than 0W30 but lower than 10W30. This means it will have a free flow at a lower temperature compared to 10W30.
4 key difference between 0w30 and 0w40 motor oil. Castrol 0W-30 Mobil 1 0W-40; Package: Bottle: Bottle: Viscosity: 0w-30: 0w-40: Vehicle: Car: Car: Liquid Volume: Most vehicles recommend a 0w30 or 0w40 motor oil, with some requiring 0w20 or 5w20 to manage small engines. Because they both have the same grade number, the 0w30 and 0w40 are

From Mobil website, comparing Mobil 1 0W20 and 5W20: SAE Grade 0W-20 5W20 Viscosity @ 100ºC 8.7 8.9 Viscosity @ 40ºC 44.8 49.8 Viscosity Index 173 160 HTHS Viscosity 2.7 2.75 Flash Point 224 230 TBN 8.8 NA MRV @ -40ºc 9200 NA M1 AFE 0W20 is very slightly thinner than 5W20 at operating temperature, but much thinner at start up therefore

The first number, however, is different - "0", compared to "5". (Technically, these numbers are attached to the "W" too, but we'll come onto that in a little bit). Since 0 is less than 5 (if you know your math), it means that ( at a certain temperature) 0W20 is less viscous than 5W20. Or, if you prefer, it's thinner.
Other oil grades are available including 0w30, 0w40 and a wide range of high viscosity grades that are best to use during the warm summer months. The main difference between the two is that 0w20 has a lower viscosity than 5W30, which means it flows more easily and can provide better fuel economy. However, both oils have the same basic
The resistance created by the cold oil is measured and converted to "centipoise" (or "cP"). Centipoise is a viscosity measurement unit. Higher centipoise values mean that a greater amount of energy is required to crank over the oil in cold temps. "0W" motor oils are measured at -35°C, while "5W" motor oils are measured at -30
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    • difference between 0w20 and 0w30