Is Oil Burning a Common Phenomenon in the Highlander?

[LaValerie]

Oil burning is a common phenomenon in the Highlander. The main causes of oil burning include: 1. Low oil quality grade: Using oil of poor quality or viscosity grade that does not meet requirements can lead to increased wear. Additionally, oil viscosity that is too low or too high can result in poor engine lubrication, increased wear on piston rings and cylinder walls, reduced sealing performance, and ultimately oil burning. 2. Large piston clearance: Excessive clearance between piston rings and cylinder walls, improper installation of piston rings, or degraded sealing performance can cause oil on the cylinder walls to enter the combustion chamber, leading to oil burning. Furthermore, poor sealing performance of valve seals, damage to the Positive Crankcase Ventilation (PCV) valve, or clogged crankcase ventilation ports can increase crankcase pressure, allowing oil to enter the cylinders along with crankcase gases and participate in combustion. 3. Excessive oil filling: Overfilling oil can also cause oil burning. When the oil level exceeds the midpoint, excessive oil pressure can cause too much oil to splash into the combustion chamber during engine lubrication, leading to burning.