What are the reasons for Volkswagen VR6 engine burning oil?
2 Answers
Volkswagen VR6 burning oil reasons are as follows: 1. Carbon deposits: Due to the difference between domestic fuel quality and international standards, a large amount of carbon deposits are easily formed in the combustion chamber during engine operation. Carbon deposits are the root cause of various engine problems. Carbon deposits accumulate in the piston grooves, causing the piston rings to stick together, which prevents the piston rings from sealing completely. The 'stuck' piston rings greatly reduce the oil sealing capacity. In addition, sludge can also clog the oil return holes, preventing the oil from returning normally, leading to increased oil consumption. Carbon deposits also exacerbate the wear between the piston and cylinder wall, causing excessive clearance and allowing oil to enter the combustion chamber. 2. Valve stem seal corrosion and aging: Corrosion and aging of the valve stem seals result in poor sealing. Valve stem seals are one of the most prone-to-age components in the engine. Basically, cars with over 100,000 kilometers of driving have this problem.
I've encountered quite a few cases of Volkswagen VR6 engines burning oil, and the most common issue is the aging and wear of internal components. If the piston rings are stuck by carbon deposits or worn out themselves, they can't seal the oil properly, allowing it to sneak into the combustion chamber and burn. The valve stem seals are also prone to aging and loosening, causing oil to drip and leak in. Additionally, when the oil separator in the PCV system is clogged or malfunctioning, it can draw oil vapor into the intake pipe, which then gets burned. Over time, cylinder bore deformation can also occur, and since this Volkswagen engine is designed for high RPMs, the high temperatures accelerate component wear. For older cars, it's advisable to regularly check the condition of the seals and carbon buildup. Switching to a slightly higher viscosity full synthetic oil can help somewhat, but the root problem still requires professional disassembly and repair by a skilled mechanic. Otherwise, the oil burning will worsen and potentially damage the catalytic converter.
