Is Oil Burning a Common Issue with the Highlander?

1 Answers
Hernandez
07/30/25 6:51am
For some older Highlander models, oil burning is a relatively normal phenomenon. There are many causes of oil burning, such as improper oil usage, lack of maintenance, poor cylinder sealing, weak valve seal performance, damaged crankcase ventilation valve, or clogged crankcase ventilation ports, all of which can lead to oil burning. The above reasons can accelerate oil consumption, resulting in oil burning and causing the following vehicle issues: 1. Poor sealing: Carbon buildup in the combustion chamber can cause the piston rings to stick, leading to poor sealing. 2. Weak oil-scraping performance: Sludge in the lubrication system can clog the oil return holes of the oil rings, weakening oil-scraping performance. 3. Wear: Wear occurs between the pistons and cylinder walls. 4. Sealing failure: Corrosion and aging of the valve seals can cause sealing failure. Additionally, modern vehicles are equipped with a crankcase ventilation system (PCV valve), and if this system malfunctions, it can also exacerbate oil consumption. In the past, oil burning issues could only be resolved through disassembly and repair, but now there are solutions available that do not require disassembly.
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