What Are The Effects Of Different Grades Of Diesel On Heavy Duty Truck Engines

Overseas heavy-duty truck users often mix different grades of diesel indiscriminately in their daily operations, thinking that as long as the vehicle can be started, it will not affect the engine working conditions. In fact, the pour point viscosity and combustion performance of different grades of diesel such as 0-10-20 are greatly different. Long term misuse of mixed oil can directly change the engine combustion state, causing a decrease in power, an increase in fuel consumption, carbon deposition, and wear of fuel injectors, shortening the engine life, and a series of hidden problems. Many fleets only focus on oil maintenance but ignore the issue of diesel grade adaptation, resulting in a soaring failure rate and high maintenance costs in the later stage of the vehicle. Understanding the specific impact of different grades of diesel on heavy-duty truck engines according to temperature conditions, accurate oil selection is the basis for protecting the engine and reducing operation and maintenance costs. Firstly, commonly used grade 0 diesel is adapted to normal temperature, mild seasons, and suitable oil viscosity High combustion efficiency can fully release engine power, suitable for overseas regions with temperatures above zero all year round. Long term use of No. 0 diesel in low-temperature environments can lead to diesel wax deposition, oil circuit blockage, filter icing, and poor oil pump suction, directly causing insufficient fuel supply. The engine shakes and stalls, and the power drops sharply. When severe, it can strain the high-pressure oil pump, wear the fuel injector, and cause irreversible damage to precision components. Secondly, low-temperature negative grade diesel is specially designed for cold regions. Negative No. 10 and No. 20 diesel have a lower pour point and better low-temperature fluidity to avoid wax deposition and oil circuit blockage in winter, ensuring smooth low-temperature start-up. However, many users in high-temperature areas blindly use negative grade diesel. This type of oil has a slightly lower calorific value, lighter viscosity, and long-term use at room temperature and heavy load can result in insufficient combustion speed, insufficient explosive power, heavy load climbing power, and weak fuel injection nozzle. At the same time Carbon deposition accelerates accumulation Long term use can lead to clogged fuel injectors, excessive exhaust emissions, and abnormally high fuel consumption. In addition, improper adaptation of high-grade diesel to working conditions can exacerbate engine precision component wear. Heavy duty trucks and high-pressure common rail engines have extremely high requirements for diesel viscosity and purity. Misuse of low-temperature negative grade diesel at room temperature can cause the oil to be too thin and unable to form an effective oil film, resulting in dry wear and tear of the high-pressure fuel pump and fuel injectors. Precise coupling gaps can cause pressure relief, oil leakage, and unstable idling, making it difficult to start. Forced use of 0-grade diesel at low temperatures can lead to increased wax and impurities, which can scratch the precision components of the oil circuit and cause oil circuit jamming and uneven fuel supply. Long term mixing of different grades of diesel is extremely harmful. Different grades of diesel additives have different viscosity and calorific values, which can cause the oil to layer, deteriorate, and the combustion stability to deteriorate. The engine may Airway and Three Elements Later The handling system has caused torque and speed limit faults, greatly reducing the overall attendance rate of the vehicle. Many overseas drivers have misconceptions that the higher the grade, the better the quality of the oil. In fact, diesel grade only represents pour point and does not represent purity. Different grades have no superiority or inferiority, and only adapt to high temperature areas. Use 0 grade diesel for low temperature environments. Use negative grade diesel to maximize the matching of engine working conditions. Protect the fuel system and improve combustion efficiency. Proper adaptation of grade diesel can stabilize engine power, reduce carbon deposition and wear, reduce post-processing faults, and extend the service life of high-pressure fuel pump injectors. Help overseas heavy-duty truck fleets effectively reduce fuel loss and parts replacement costs to achieve long-term stable operation of vehicles