What is the national standard for automotive diesel?
3 Answers
Currently, the national standard for automotive diesel testing is GB∕T19147—2003 "Automotive Diesel", which is formulated with reference to the European standard EN509─1998 "Automotive Diesel". Introduction: Tire pressure, strictly speaking, refers to the air pressure inside the tire. In terms of car maintenance, the engine is the heart of the car, and the damage to the engine will lead to the exhaustion of the car's life. Then, the tire pressure is the blood pressure of the car. The level of tire pressure plays a vital role in the performance and power of the car. The importance of maintaining normal tire pressure: If the tire pressure is too high, the friction and adhesion of the tire will decrease, affecting the braking effect; it will cause the steering wheel to vibrate and deviate, reducing the comfort of driving; it will accelerate the partial wear of the tread pattern in the center of the tire, reducing the life of the tire. If the tire pressure is too low, the friction coefficient with the road surface will increase, leading to higher fuel consumption; it will cause the steering wheel to be heavy and easy to deviate, which are factors that are not conducive to driving safety.
Last time at the gas station someone asked about this, I remember that diesel now mainly meets China V and China VI standards. China VI diesel is much more complex—not only must sulfur content be below 10 milligrams per kilogram (cleaner than mineral water), but the cetane number must also be above 51 to ensure smoother engine operation. The flash point must exceed 55 degrees Celsius for safety, and the pour point varies with seasonal controls, with winter grades like -10°C and -35°C. Polycyclic aromatic hydrocarbons are capped at 7% to reduce carbon deposits. Fellow drivers should always look for the China VI label on the fuel dispenser. Although small gas stations offer cheaper fuel, their diesel may not even meet sulfur content standards.
Having repaired diesel vehicles for over a decade, veteran mechanics often emphasize that fuel quality directly impacts engine lifespan. China's national standards impose stringent requirements on diesel: since 2023, the nationwide adoption of China VI-B mandates ultra-low sulfur content (0.001%), with winter-grade -10 diesel requiring a pour point below -10°C. Key parameters like cetane number (minimum 51) reduce knocking, while density range (820-845kg/m³) optimizes fuel efficiency. Always refuel at authorized stations—substandard fuel from small refineries often exceeds acid value limits, and a single clogged injector repair could cost you three tanks of fuel.
