What does the standard number of oil represent?

[VonMalia]

The standard number of oil represents the octane rating of gasoline. Selection basis: The main basis for selecting gasoline grades is the engine's compression ratio. Blindly using high-grade gasoline will not only result in sluggish acceleration during driving, but also fail to utilize its high anti-knock advantage, leading to a waste of money. Therefore, carefully selecting the gasoline grade is crucial. Compression ratio: The primary standard for selecting gasoline grades in cars is the engine's compression ratio, which is also a core energy-saving indicator of modern vehicles. The engine's operation consists of a cyclical motion of "intake - compression - combustion - exhaust - intake" in the cylinders. The compression ratio is the ratio of the cylinder volume when the piston is at its farthest and nearest points in the stroke.