What's with burning engine oil?
When the sealing effect of the engine piston ring decreases, or the residual lubricating oil on the cylinder wall cannot be scraped clean, excess engine oil will remain in the combustion chamber and burn with the mixed gas. The gas discharged after combustion is usually blue and has a pungent burning smell. In addition, in addition to the piston ring damage will lead to oil into the cylinder, there are also valve oil seal damage will also lead to oil combustion. Valve oil seals are usually made of rubber and plastic. When it works in the high temperature environment inside the engine, it will become hard and lose its elasticity over time, and the oil will flow into the cylinder along the valve stem to participate in combustion. Therefore, to distinguish the real oil fault, we can judge it by the color of exhaust gas.
Second, whether the oil consumption is greater than the normal consumption in a fixed period.
Generally speaking, the fuel consumption is not more than 1L/1000 km, but different models have different regulations. Please refer to the vehicle maintenance manual for details. 10000 km in the initial running-in period, the fuel consumption may reach 0.3 liter/1000 km; After driving 10000 km, the fuel consumption will remain within 0.2 liter/1000 km. Car owners can use these data to observe, check the oil level before using the car and make records. After a period of time, it can be judged whether there is a fuel burning fault in the vehicle.
Third, whether the vehicle leaks oil.
Although oil leakage is different from burning oil, they can also lead to oil shortage. If we want to judge whether there is a real oil burning fault in the vehicle, rather than the illusion of oil burning caused by oil leakage, we must first eliminate the problem of oil leakage in the vehicle. For example, the oil seal inside the turbocharger is damaged, which causes the oil to flow into the exhaust pipe and burn and evaporate. This kind of oil leakage is very hidden, and it needs careful investigation to find the oil leakage point. After the oil leakage is eliminated, if the engine oil is still often lacking, it can basically be determined that the vehicle has a fault of burning engine oil. The above three points are common methods to judge vehicle oil combustion. In application, it is necessary to combine three points to judge the result, instead of considering that the vehicle has engine oil combustion failure when one of the conditions is met.