Skip the auto shop - Our mechanics make house calls

Q: Found oil leak when changing spark plugs

asked by on

I have owned my car for about four years now. When I went to do the routine maintenace yesterday - replacing the spark plugs, I found that all four spark plug sockets have oil leaks when I took out the boots. The plugs looked like they were in decent condition, and there was no gunk. The oil level seems fine. I'm wondering if this might be caused by a bad head gasket or valve cover. Would one of those cause this problem, and how much might it cost me to get it fixed?

A: Hi there. This is very common on your vehic...

Hi there. This is very common on your vehicle. This is caused by the valve cover gasket tube seals. These fail all of the time because they become brittle as the engine gets older. Once that occurs, they start to leak and allow oil to enter the tubes. I typically replace the gaskets and the coil boots along with the spark plugs so that I do not have to go into the same repair a second time. If you need to have this done, consider YourMechanic, as a certified mechanic can come to your home or office to inspect your oil leak. From there, they will be able to make the necessary repairs to have this issue resolved.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car stalls at a low speed

Hello. You can try and clean the IAC valve, but if it is bad, it will need replacement. Cleaning the IAC valve would only be a temporary fix. The IAC valve is usually attached to the throttle body, and can...

Q: What is going on with my car?

Hi there. Check the fuel injectors and see if they are working or not. If the fuel injectors are not working, then you would need to replace the fuel injectors. If the fuel injectors are fine and the engine operates...

Q: Average price to replace a 2005 scion xb 1.5L motor in CA.

Billing question sent to CS for the cost to replace an engine in a 2005 Scion xB. The engine size is L4-1.5L.

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.