valve cover gasket leak symptoms
Rachel Hernandez
Updated on June 11, 2026
The short answer is, yes. If your engine is losing oil, running the car for too long without an inspection and repair can cause permanent damage. If the gasket is worn out, it will leak engine oil and the top of the engine will be likely be covered in oil.
How do I know if my valve cover gasket is leaking?
The telltale sign of a valve cover gasket that has lost its seal is an oil-covered valve cover or a burning oil smell when the engine is running. As oil leaks from a valve cover, it can contact a hot exhaust manifold and burn. Smoke can then waft into the cabin.
Can you drive with a leaking valve cover gasket?
Q: Can you drive a car with valve cover leaks? Yes, you can drive a car with a valve cover leaks in as much as the amount of oil leaks from the valve cover gasket is small, and the oil is not dripping on hot engine parts like the exhaust manifold or pipes.
What problems can a leaking valve cover cause?
Engine is running rough and misfiring
Sometimes when oil leaks from a valve cover gasket it leaks all the way down to the spark plug well and eventually seeps inside the spark plug tubes. This will cause a misfire or reduce engine performance. It can also cause a fire under your hood if it goes unrepaired.
How much should it cost to replace a valve cover gasket?
On average, the replacement cost of a valve cover gasket will be somewhere between $100 and $350. The parts cost will typically be between $30 and $50 while the labor costs will be anywhere from $70 to $300.
What’s the average cost of a valve cover gasket?
What is the typical cost of a valve cover gasket? The typical total cost of a valve gasket replacement is around $110 – $340 depending on the make and model of the vehicle. The parts cost very little – perhaps $10 to $40. The labour makes up the bulk of the cost: from $100 to $300.
Can a leaking valve cover gasket cause a misfire?
A leaking valve cover gasket can cause a misfire if oil is leaking into the spark plug wells. But that is usually not the problem. Most often the misfire will have a separate cause. But a leaking valve cover can cause smoke, bad smells and even fire, so it is in your best interest to take care of it right away.
What happens if you don’t replace valve cover gasket?
It’s responsible for sealing the oil within the valve cover so it won’t leak out of your engine. As you can imagine, when a gasket starts to fail, it won’t be able to seal properly and oil will start leaking out. There will be noticeable symptoms that affect the car’s operation and you will need to replace it.
What causes valve cover gasket failure?
This gasket gets brittle and cracks caused by exposure to debris, dirt, temperature, and other substances over time. The valve cover gasket may lose its quality and leak when this happens, resulting in visual concerns such as oil leaks, drivability, and engine performance difficulties.
How many miles do valve cover gaskets last?
When running your vehicle, the valve cover will have to do its job and keep the oil from leaking out. Most of the gaskets on your car last anywhere from 20,000 to 50,000 miles.
How long does it take to replace a valve cover gasket?
In many cases, valve cover gasket replacement can be completed in 1-2 hours, leading to only modest labor charges. However, it can take as long as 4-5 hours to complete the same job on other more complex engines.
Can a leaking valve cover gasket cause low oil pressure?
The valve cover gaskets are vital to vehicle functionality – they prevent oil from leaking all over the cylinder head and the engine block. A faulty valve cover gaskets can cause many things to happen with your car however, it will not cause a low oil pressure.
What is the difference between a head gasket and a valve cover gasket?
The head gasket is located between the engine block and the head. The valve gasket is located above the head to keep oil leaking out of the valve cover.
How important is it to replace leaking valve cover gasket?
How often should it be replaced? There are no maintenance requirements for a valve cover gasket. It only needs to be replaced if it leaks. If the valve cover gasket is old, it’s also often replaced when doing a major engine repair.
Is the valve cover gasket part of the engine?
A valve cover gasket seals the valve cover to the top portion of the engine cylinder head. The gasket prevents motor oil from leaking out as it travels around the camshafts, rockers and valves. In addition, many spark plug ports are sealed by the valve cover gasket.