If your valve cover gasket is leaking, it means oil is seeping out from the top of the engine where the valve cover seals against the cylinder head. The valve cover gasket keeps engine oil inside while protecting the valve train components. Over time, the gasket can harden, crack, or shrink, leading to oil leaks. A leaking valve cover gasket should be addressed promptly to prevent oil loss, engine damage, and potential fire risks from oil contacting hot components.

What does it mean if the valve cover gasket is leaking?

It means the seal between the valve cover and cylinder head has failed. This allows oil to escape, which can drip onto the engine block, exhaust manifold, or spark plug wells, leading to performance and safety issues.

Common causes of a leaking valve cover gasket

• Normal wear and tear over time
• Excessive engine heat causing gasket hardening
• Improper installation or over-tightened bolts
• Blocked crankcase ventilation increasing pressure

Why do you need to fix this problem quickly?

Ignoring a leaking valve cover gasket can cause oil loss, which leads to low oil levels and engine wear. Oil dripping onto hot exhaust components increases the risk of smoke or fire. It can also foul spark plugs and cause misfires.

How do you know when to get it checked?

You should book an inspection if:

• You notice oil spots under your car
• You smell burning oil while driving
• There is visible oil around the top of the engine
• The engine misfires due to oil in spark plug wells
• Your oil warning light comes on or oil levels drop

What happens during an assessment?

A mechanic will:

1. Inspect the valve cover and gasket for leaks
2. Clean the area to confirm the source of the oil leak
3. Check the crankcase ventilation system
4. Replace the valve cover gasket if necessary
5. Top up engine oil and test for further leaks

How much does it cost to fix?

Valve cover gasket replacement typically costs $250–$600, depending on the vehicle make and model. Costs may be higher if additional parts like spark plug seals need replacement at the same time.

Is it unsafe to drive with a leaking valve cover gasket?

Yes. While you may still be able to drive, a leaking gasket risks oil loss, engine misfires, and even fire hazards. It should be repaired promptly to maintain safety and engine performance.