What Causes Oil Burning in Dongfeng Nissan Sylphy?

[Tom]

Nissan Sylphy vehicles experiencing oil burning may be due to the following reasons: 1. Poor fuel quality can easily lead to carbon deposits, which in turn accelerate wear between the piston and cylinder wall, creating excessive gaps that allow oil to enter the combustion chamber. 2. Carbon deposits accumulating in the piston grooves can cause the piston rings to stick together, preventing them from sealing properly. This significantly reduces the oil-scraping and sealing capability of the rings. Additionally, sludge can clog the oil return holes, preventing proper oil circulation and increasing oil consumption. 3. Corrosion and aging of the valve stem seals can lead to poor sealing. Valve stem seals are among the most prone-to-wear components in the engine, and most vehicles with over 100,000 kilometers driven will have this issue. 4. Aging of the front and rear crankshaft oil seals. These seals are in constant and extensive contact with oil, and impurities in the oil, along with the engine's temperature fluctuations, gradually weaken their sealing effectiveness, leading to oil seepage or leakage. 5. Clogged air filters and dirty throttle bodies can restrict airflow, reducing intake pressure and creating a vacuum that draws oil into the combustion chamber, causing oil burning. A clogged oil filter can also increase oil consumption. 6. High fuel content in the oil due to poor fuel supply system performance or improper fuel atomization can allow fuel or overly rich fuel mixtures to enter the crankcase and mix with the oil, diluting it. 7. Damage to the oil seal between the turbocharger and intake pipe, primarily caused by extended oil change intervals or the use of low-quality oil, leading to insufficient lubrication and cooling of the turbocharger's floating main shaft and subsequent seal damage.