10w50什麼意思

"10w50" is a type of motor oil viscosity grade. The "10w" portion refers to the winter (low-temperature) viscosity rating, while the "50" indicates the oil's high-temperature, high-shear (HTHS) viscosity rating.

Here's what each part means:

1. The "10w" is the winter (low-temperature) viscosity rating, which is represented by the number before the "w" (which stands for "winter"). This number indicates the oil's resistance to flow at low temperatures. A lower number means the oil is less viscous (thinner) and flows more easily in cold weather, making it easier to start your engine.

2. The "50" is the high-temperature, high-shear (HTHS) viscosity rating, which is represented by the number after the "w". This number indicates the oil's resistance to thinning out when exposed to high temperatures and high levels of mechanical shear stress, such as when your engine is hot and under heavy load. A higher number means the oil is thicker and provides better protection at high temperatures.

So, a 10w50 oil is designed to provide good cold-weather starting and low-temperature flow, as well as good protection against oil breakdown and wear at high temperatures and under heavy loads. It's a popular choice for vehicles that operate in a wide range of temperatures and conditions.