GMC Sierra 1500 HD Classic Oil is leaking into spark plug well Inspection at your home or office.

Our certified mobile mechanics come to you 7 days a week between 7 AM and 9 PM.

Estimate price near me

Service Location

Customer Ratings

(2,948)

How A Diagnostic Works

Instantly book a certified mobile mechanic to come to you

Mechanic diagnoses the problem and quotes necessary repairs

Your vehicle is ready to go

Fair, upfront & transparent pricing for all services

Our certified mobile mechanics can come to you now.

Customer Ratings

(2,948)

Oil is leaking into spark plug well Inspection Service

How much does a Oil is leaking into spark plug well Inspection cost?

On average, the cost for a GMC Sierra 1500 HD Classic Oil is leaking into spark plug well Inspection is $95 with $0 for parts and $95 for labor. Prices may vary depending on your location.

CarServiceEstimateShop/Dealer Price
2007 GMC Sierra 1500 HD ClassicV8-6.0LService typeOil is leaking into spark plug well InspectionEstimate$114.99Shop/Dealer Price$124.99 - $132.49
Show example GMC Sierra 1500 HD Classic Oil is leaking into spark plug well Inspection prices

Oil leaking into the spark plug wells is an indictor of a fairly serious problem that should be inspected and repaired immediately. It is almost always due to a failing gasket or O-ring but can also be the result of a failing piston or worn valve guides.

Oil making its way into the spark plug wells will drastically affect the engines performance, leading to misfires, increased oil consumption and blue exhaust. In extreme cases, it can even lead to an engine fire. If the vehicle is exhibiting any of these symptoms, the spark plugs should be inspected immediately.

How this system works:

his issue involves two systems, the spark plugs and the engine lubrication system.

The main function of a spark plug is to ignite the fuel/air mixture in the combustion chamber. Electrical energy is transmitted through the spark plug where it jumps the gap and the spark ignites the gasoline and air mixture. Spark plugs also pull heat out of the combustion chamber, working as a heat exchanger, it pulls thermal energy from the combustion chamber and transfers it to the cooling system.

Engine oil is used to lubricate the moving parts of an engine. The constant moving of the engine parts generates heat, as well as wear and tear. Engine oil helps to minimize the friction and dissipates the heat generated by the engine.

The oil pan is where engine oil is stored. A typical oil pan will hold up to 6 quarts of oil. When the engine starts, the oil pump pulls oil from the oil pan through a part called the pickup tube. The oil then moves to the oil filter, which removes dirt and debris before it is sent to the various parts of the engine via spurt holes. Eventually it heads back to the oil pan to start the process over again.

Common reasons for this to happen:

  • Leaking Valve Cover Gaskets: The valve cover is a metal part found on the top of the engine, which seals the engine and helps prevent oil leaks. Between the valve cover and the engine are gaskets that tend to fail over time. Due to the high temperature of the engine the gaskets can get brittle, and start to leak. It is possible for the oil to leak into the spark plug wells. Leaking valve cover gaskets need to be repaired as quickly as possible, failing to do so can lead to further damage to the engine.

  • Failing O-Ring Seals: There are O-Ring seals at the bottom of the spark plug wells and if a seal starts to fail, oil can leak past these seals and into the spark plug well. Again, this issue should be repaired as soon as possible and the spark plugs should be changed as well.

  • Failing Piston Compression Rings: The pistons in a car’s engine have compression rings at the top of the piston and the bottom. These rings are set in grooves in the piston and help scrape excess oil from the cylinder walls and prevent oil from getting into the combustion chamber. If these rings fail, oil can make its way into the spark plugs wells. Other symptoms of failing compression rings include increased exhaust that is blue and smells oily.

  • Failing Piston: A piston that is running too hot can develop a hole or crack. The most common symptoms of a failing piston include rattle and knocking noises while the car is running, excessive oil burning as well as a loss of power and engine misfiring. It can also lead to oil in the spark plug wells. This is an extremely serious condition that needs to be repaired as soon as possible.

  • Worn Valve Guides: Valve guides help to regulate air intake by keeping the valves in place while the engine is running. Over time, valve guides can become extremely worn and will require replacement. Blue smoke and oil or ash in the spark plug wells is a common symptom of failing valve guides. Worn valve guides can lead to more serious engine problems and should be repaired as soon as possible.

What to expect:

A top-rated mobile mechanic will come to your home or office to determine the source and cause of the Oil in Spark Plug Well issue, ​and will then provide a detailed inspection report that includes the scope and cost of the necessary repairs.

How it's done:

A mechanic will check your valve cover gaskets, O-Ring seals, pistons and other important components. The mechanic may need to crank the car and test drive it to pinpoint the cause of the leak and produce an accurate diagnosis.

How important is this service?

Oil in a spark plug well is a very serious problem that should be repaired as soon as possible. It can do extensive damage to the engine, such as broken or warped pistons and valves. Eventually, if not repaired, the head gasket can result in the fatal destruction of the engine. There is also the potential for an engine fire if the spark plugs ignite the oil.

Fast and easy service at your home or office

Backed by 12-month, 12.000-mile guarantee


Meet some of our expert GMC mechanics

Real customer reviews from GMC owners like you.

Excellent Rating

(2,948)

Rating Summary
2,788
79
21
10
50
2,788
79
21
10
50

Rusty

23 years of experience
515 reviews
Rusty
23 years of experience
GMC Acadia V6-3.6L - Oil is leaking into spark plug well - Arlington, Texas
Very knowlegable on time and didn't take long highly recommended

Francisco

18 years of experience
65 reviews
Francisco
18 years of experience
GMC Acadia V6-3.6L - Oil is leaking into spark plug well Inspection - Plano, Texas
Francisco was on time, very friendly and explained everything thoroughly. I would highly recommend him to anyone!

Jarius

21 years of experience
49 reviews
Jarius
21 years of experience
GMC Sierra 1500 V8-5.3L - Oil is leaking into spark plug well Inspection - Silver Spring, Maryland
Helped me out confirming my research and explaining the next steps.

Russell

27 years of experience
271 reviews
Russell
27 years of experience
GMC Terrain L4-2.4L - Camshaft Position Sensor Replacement - Oakland, California
I'm very appreciative to Russell for his diligence and professional work on my vehicle. Even through obstacles like undesirable weather and being given the wrong parts, he persevered and did what was necessary to get the job done. Thx Russell and thank you to Your Mechanic! 5stars all around

Excellent Rating

(2,948)

Rating Summary
2,788
79
21
10
50
2,788
79
21
10
50
Number of GMC services completed
32428+
services done by our mechanics
TOTAL NUMBER OF EXPERT GMC MECHANICS
900+
experts on our platform

Recent articles & questions

How to Find Inexpensive Used Cars
There There was a time when the phrase “I just got a great deal on a used car” was code for “I think he just got suckered into buying a clunker.” That’s no longer the case. Nowadays, cheap used cars...
The Guide to Right-of-Way Laws in West Virginia
The The key to safe driving is based on common courtesy. But since not everyone is courteous, right-of-way rules are also codified in West Virginia. These laws are in place to keep you safe, and you need to know them....
How to Tell the Difference Between LSD and ULSD Fuel
Low Low sulfur diesel (LSD) was replaced with ultra-low sulfur diesel (ULSD) in 2006 as part of an initiative to substantially lower the emissions of particulate matter in diesel (https://www.yourmechanic.com/article/5-essential-things-to-know-about-owning-a-diesel-car) engines. The initiative began in the European Union and later...

Car turns over but doesn't start.

There could be several reasons behind why your Honda Prelude will not start. A simple test you can try first yourself is to turn the key to the ON position (do not start the car) and see if the check...

Transmission stuck in park

In order to shift out of park, the transmission module needs to see the engine idling and the brake pedal depressed. If one of these criteria is not met, then it will not let you shift out of park. There...

Driver's side headlight keeps burning out. High beams and running lights are fine.

Hello. Thank you for writing in. There are several reasons why your bulb would continue to burn out prematurely. The first thing you want to check is that you are wiping any oils from your hands off of the bulb....

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (844) 997-3624 · hi@yourmechanic.com