Their sole job is to prevent oil from the rocker arm assembly from sliding down the valve stem and into the intake or exhaust ports. If the PCV valve or hose becomes clogged with sludge and varnish, pressure builds up inside the crankcase.
How Valve Seal Failure Causes Car Burning Oil
While thinner oil improves fuel economy and cold-start performance, it offers less control, allowing oil to slip past worn rings into the combustion chamber more easily. A scenario where the engine is burning oil and smoking heavily is often the result of neglect or harsh operating conditions.
The oil control ring scrapes excess lubricant off the cylinder wall and returns it to the sump. This excessive pressure forces oil past any weak seals it can find, including those around the valve guides and rings.
How Valve Seal Failure Causes Car Burning Oil
A stuck PCV valve is one of the most common and easily corrected causes of excessive oil consumption. The Core Culprits: Valves and Seals The vast majority of modern engines burn oil because the barrier between the combustion chamber and the moving parts has been compromised.
More About Why is my car burning oil
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More perspective on Why is my car burning oil can make the topic easier to follow by connecting earlier points with a few simple takeaways.
