The engine is the heart of a car, and the heart needs to supply blood. But if the blood supply is insufficient or the blood quality is bad, it directly affects the work of the heart. For the car, the quality of the oil directly determines the efficiency of the engine. And some users reflect that some oil is easy to blacken after the use of oil, why? Is it easy to blacken the oil after the oil is used?

Isoil blackening a quality problem?

Many owners have encountered such a situation. Oil is blackened after one or two weeks. It is like ink. So it is too subjective to decide that this oil is fake oil. Indeed, if the grade of oil is too low, or the oxidation stability is not good or no additives, this phenomenon will happen. However, most of the reasons for the oil blackening are still related to vehicle condition.

The combustion performance of the vehicle is not good, especially diesel vehicles, incomplete combustion of soot generated by the black into the oil in the oil pollution, especially the old car and after overhaul vehicles, such a situation more; in addition, the old oil is not released on the net, the crankcase residual sludge, coke, paint is not after cleaning, add new oil after the oil has a strong cleaning function, the cleaning out suspended in the oil, the black, if too much sediment will be blocked, oil filter and oil pressure low phenomenon, this time should replace the oil. Furthermore, it is a vehicle with large oil consumption. Because of the oil burning, the oil is very easy to blacken. Black oil is not necessarily black. It is often caused by poor condition. Once the engine is found to be black, it is a signal for your car's poor performance. It's best to stop the car to check for more serious accidents. In a diesel engine, either a gasoline engine or a diesel engine will cause incomplete combustion for a variety of reasons. The oil sludge in the oil bottom shell of the gasoline engine is mainly caused by the parking and opening of the car, and the burning of the engine is not fully caused by the full use of the horsepower. According to the study of the tracer atoms, the sludge is mainly derived from gasoline rather than from lubricating oil. The higher the olefin content, the more sludge will be. For diesel soot, due to the mechanical structure and quality of fuel will produce carbon black. Diesel sulfur content and high olefin content will cause the soot content is very high and the oil soon turned black.

When does the oil change?

In general, after adding new oil, the sediment and carbon deposits on the machine parts are dispersed in the oil, and the color of the oil will be darkened after a certain time.

The experienced master will judge whether it needs to be replaced by the viscosity of the oil. Instead of observing that the oil is black, it is determined to be replaced.

Under normal circumstances, the owner can determine whether to replace it according to the mileage and shelf life of the oil. The ordinary oil is replaced 5000 kilometers, the semi synthetic oil is replaced by 7500 kilometers, and the total synthetic oil is replaced 10000 kilometers. The replacement cycle should be shortened in frequent traffic jams or under high temperature and cold conditions. In addition, if the oil exceeds its expiration date, the mileage should be replaced even if the replacement period is not reached. If the owner keeps on driving for a long time with frequent braking and speeding up bad driving habits, the oil changing cycle should also be ahead of schedule, which is because bad driving habits tend to accelerate the wear of various parts inside the vehicle.