機油w意思

"W" in motor oil stands for "Winter" and is used to indicate a motor oil that is suitable for use in cold weather. The "W" designation is used in front of a number that represents the oil's weight, such as 5W-30 or 10W-40. The lower the number before the "W," the thinner the oil will be and the better it will flow in cold temperatures. This is important for starting your engine and preventing wear and tear on your vehicle's components during cold starts.