Ford Mustang Engine Valve Cover Gasket Replacement Guide (2012-2023)
Fixing that burning oil smell and stopping leaks is easier than you think for your 2012-2023 Mustang.
- A burning oil smell is the most common sign of a failing valve cover gasket on a Mustang.
- For 2015-2017 5.0L models, a known issue with warping plastic covers may require a TSB fix or upgrading to aluminum covers.
- Thoroughly cleaning the cylinder head and valve cover surfaces is critical for a leak-free seal.
- Choose a quality aftermarket brand like Fel-Pro or Victor Reinz for a reliable repair that often exceeds OEM quality.
Is Your Mustang Leaking Oil? Check the Valve Cover Gaskets
If you're smelling burning oil or seeing smoke from under the hood, there's a good chance your Mustang's valve cover gaskets are failing. This is a common issue as a vehicle ages. The gaskets are located at the top of the engine, and when they leak, oil drips onto hot components like the exhaust manifold, causing a distinct and unpleasant smell. 🎬 Watch: Common signs and symptoms of a failing gasket. You might also notice oil stains on the valve covers themselves or on the ground where you park.
Known Issues for 2012-2023 Ford Mustangs
For some 2015-2017 Mustang GT models with the 5.0L Coyote engine, Ford issued a Technical Service Bulletin (TSB 19-2309). This TSB addresses oil leaks caused by the plastic valve covers warping from excessive heat. The official fix involves drilling the covers to add more fasteners for a more secure seal. While this is the dealer procedure, many owners choose to upgrade to aluminum valve covers, 🎬 See how to install upgraded valve covers and intake manifolds. like those from the GT500, which are less prone to warping and often come with all bolt holes pre-drilled. Owners of EcoBoost models have also reported leaks, sometimes due to improper sealant application at the factory or cracks developing in the plastic covers.
Don't Ignore the Leak
A small leak might not seem urgent, but it can lead to bigger problems. Low engine oil can cause serious internal engine damage. Oil can also leak into the spark plug wells, leading to engine misfires, rough idling, and a flashing check engine light.
Choosing the Right Aftermarket Gasket Set
You don't need to buy an expensive OEM gasket from the dealer. High-quality aftermarket brands often meet or exceed OEM specifications and provide a reliable, long-lasting seal. Here’s a look at some popular choices:
- Fel-Pro: Widely regarded as a top-tier aftermarket brand, Fel-Pro gaskets are a go-to for both professional mechanics and DIYers. They are known for excellent fitment and durable materials that provide a reliable seal. Many of their kits include not just the main gaskets but also the spark plug tube seals and bolt grommets.
- Victor Reinz: Another high-quality brand, often considered an OE supplier for many manufacturers. Their gaskets are known for being made of soft, pliable rubber that seals well. Choosing between Fel-Pro and Victor Reinz often comes down to personal preference or availability, as both are excellent choices.
- Elring: Like Victor Reinz, Elring is a reputable German brand and a known OE supplier. They are a solid choice for a reliable, factory-quality seal.
- Cometic Gasket: While Cometic makes excellent gaskets, they are often geared more towards high-performance and racing applications. Their multi-layer steel (MLS) gaskets are top-notch but may be overkill for a stock daily driver with a minor leak.
Pro Tip: Clean Surfaces are Key
The success of your gasket replacement depends on how well you clean the mating surfaces. Before installing the new gasket, you must remove all old gasket material, oil, and grime from both the cylinder head and the valve cover. A plastic scraper and some brake cleaner can help get the surface perfectly clean without scratching the aluminum.
Cost of Replacing Ford Mustang Valve Cover Gaskets
The cost can vary depending on your Mustang's engine and who does the work. A V8 is generally easier to work on than an EcoBoost, where more components may need to be removed.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Gasket Set | $38 - $139 |
| Shop Labor | $178 - $286 |
| Total DIY Cost | $38 - $139 |
| Total Professional Cost | $216 - $425 |
Frequently Asked Questions (FAQ)
Do I need to use RTV sealant with the new gasket?
Yes, but only in specific spots. You should apply a small dab of RTV silicone sealant where the engine block, cylinder head, and front timing cover meet. These are natural joints in the engine where a leak is more likely. Do not apply sealant along the entire length of the gasket, as this can cause it to slip out of place and leak.
Should I replace anything else at the same time?
Yes. While you have the valve covers off, it's a great time to inspect and potentially replace the spark plugs and ignition coils, especially if you found oil in the spark plug tubes. Also, inspect the PCV (Positive Crankcase Ventilation) valve and hoses for cracks or clogs, as a faulty PCV system can increase pressure in the crankcase and cause gaskets to fail.
How difficult is this job to do myself?
For most home mechanics, this is a very doable job. The difficulty is about a 2 out of 5. On a 5.0L V8, access is relatively straightforward. On V6 and EcoBoost models, you may need to remove more components like the intake manifold or various hoses to gain access, which adds time to the job. The most critical steps are cleaning the surfaces and tightening the bolts to the correct torque specification, which is typically 89 lb-in (not lb-ft).
🎬 Watch: 5.0L valve cover gasket replacement and torque sequence guide.My Mustang is a 2016 GT. Do I need to do the TSB drill fix?
You don't have to, but it is the recommended procedure from Ford to prevent future leaks from a warped cover. If you are replacing the gasket due to a recurring leak, it's a good idea to either perform the TSB modification or upgrade to aluminum valve covers to solve the root problem.
Helpful Videos
Technical Specifications
OEM Part Numbers: ER3Z-6584-B ER3Z-6584-A BR3Z-6584-A BR3Z-6584-B BB5Z-6584-A
Torque specification for valve cover bolts is critical: 10 Nm or 89 lb-in. Note this is inch-pounds, not foot-pounds. Over-tightening will damage the gasket or cover and cause leaks.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Ford Mustang:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Is Your Mustang Leaking Oil? Check the Valve Cover Gaskets
- Known Issues for 2012-2023 Ford Mustangs
- Don't Ignore the Leak
- Choosing the Right Aftermarket Gasket Set
- Pro Tip: Clean Surfaces are Key
- Cost of Replacing Ford Mustang Valve Cover Gaskets
- Frequently Asked Questions (FAQ)
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