I once read a rather professional statement that the engine was designed with European road conditions in mind. Therefore, there are many honeycomb structures in the engine cylinder (to store engine oil?!), which make it run more smoothly at high speeds. Conversely, due to the longer idle time on Chinese roads, it causes oil burning.
The main reasons for engine oil burning are:
Damage to the piston rings causes cylinder gas leakage, allowing engine oil to enter the combustion chamber, where it then participates in the combustion of the gas mixture, resulting in the burning of engine oil.
The main symptoms of oil burning are:
The main symptom of an engine burning oil is blue smoke coming out of the exhaust pipe. The engine will shake when idling, and the engine oil will be severely lacking during a routine maintenance (oil change) cycle (with no dripping or leaking).
In addition to the problem with the piston rings, the following reasons can also cause oil burning:
- Due to the fact that domestic fuel quality is not in line with international standards, a large amount of carbon deposits are easily formed in the combustion chamber during the operation of the engine, and carbon deposits are the root cause of various engine problems.
- Carbon deposits will accumulate in the grooves of the piston, causing the piston rings to stick together. This leads to the piston rings getting stuck and being unable to seal completely. The “stuck” piston rings significantly reduce the oil-scraping and sealing ability. In addition, sludge can also block the oil return holes, preventing the engine oil from flowing back normally, which results in an increase in engine oil consumption.
- Carbon deposits will further exacerbate the wear between the piston and the cylinder wall, resulting in excessive clearance and causing oil to enter the combustion chamber.
- The valve oil seal is corroded and aged, resulting in poor sealing. The valve oil seal can be said to be the most easily aging wearing part in the engine. Basically, cars that have traveled more than 100,000 kilometers have this problem.
- The front and rear crankshaft oil seals are aged. They are in large-area and continuous contact with oil. The impurities in the oil and the continuous temperature changes inside the engine gradually weaken their sealing effect, leading to oil seepage or leakage.
- The damage to the oil seal between the turbocharger and the intake pipe is mainly caused by excessively long oil change intervals or the use of poor-quality engine oil, which results in insufficient lubrication and heat dissipation for the floating turbo main shaft, thereby damaging the oil seal.
- There is a high proportion of fuel in the engine oil. Poor performance of the fuel supply system and inadequate fuel atomization will cause fuel or a large amount of over-rich fuel mixture to窜入 the crankcase, mix with the engine oil, and dilute the engine oil.
- A clogged air filter will cause poor air intake, reduce the intake pressure, and create negative pressure. Under this negative pressure, oil will be drawn into the combustion chamber, leading to oil burning.
- The oil filter is clogged, leading to an increase in oil consumption.
- Clogging or damage to the exhaust gas valve (oil-gas separator, positive crankcase ventilation valve, PCV valve) will cause the oil-gas mixture to solidify here and then enter the intake port along the exhaust gas recovery pipe, resulting in oil consumption.
- Piston rings are misinstalled or aligned, but this situation is rare and has a low probability of occurrence.
- Excessive engine oil was added, exceeding the upper limit of the scale.
- The throttle valve is dirty.
Currently, methods such as replacing piston rings can solve the problem of a vehicle burning oil, and there is no need to overhaul the engine…
