What is the applicable range of 5w30 engine oil?

[OLondyn]

5w30 engine oil is suitable for temperature environments above -30 degrees Celsius. The 'W' stands for winter, indicating its use in cold conditions. The number before the 'W' (0 in this case) represents the oil's viscosity at low temperatures - the smaller the number, the better the fluidity and cold resistance. The number '20' indicates the viscosity at 100 degrees Celsius - the higher this number, the greater the viscosity and high-temperature resistance. Engine oil, also known as motor lubricant, plays vital roles in engines including lubrication, cleaning, cooling, sealing, wear reduction, vibration damping, and rust/corrosion prevention. It's often referred to as the 'blood' of automobiles. Currently, there are three main types of engine oil on the market: conventional mineral oil, semi-synthetic oil, and full synthetic oil.