A Guide to the Engine Valve Cover Gasket Set for the 2007-2015 BMW 335i
Stop the burning oil smell and keep your N54 or N55 engine clean and running strong.
- A burning oil smell is the number one sign of a failing valve cover gasket on a 335i.
- For best results and longevity, choose an OEM-supplier brand like Victor Reinz or Elwis.
- Consider replacing the entire valve cover, not just the gasket, if your car has high mileage or symptoms of PCV failure.
- This is a labor-intensive job; if you're paying a shop, using a high-quality part is crucial to avoid doing the job twice.
Is Your 335i Leaking Oil?
A leaking valve cover gasket is one of the most common oil leaks on the 2007-2015 BMW 335i, affecting both the N54 and N55 engines. The gasket is made of rubber and sits between the plastic valve cover and the metal cylinder head. Constant heat cycles cause the rubber to harden, crack, and lose its seal. When this happens, oil seeps out, often dripping onto the hot exhaust manifold on the passenger side of the engine.
Diving Deeper into the Symptoms
The most obvious sign of a leak is a burning oil smell, which you might notice inside the car when stopped or outside after a drive. You may also see white smoke coming from under the hood as the oil burns off the hot exhaust components. 🎬 Watch: See how a leaking gasket causes smoke under the hood. Other signs include visible oil stains on the passenger side of the engine block, a low engine oil warning light, and potentially oil fouling the spark plugs, which can cause the engine to run poorly.
Should I Replace the Whole Valve Cover?
It's a common question for 335i owners. The original plastic valve cover can also become brittle and crack or warp over time. More importantly, the N54 and N55 engines have a crankcase ventilation (PCV) system integrated into the valve cover. If this system fails, it can cause similar symptoms to a bad gasket and lead to other engine problems. Many mechanics recommend replacing the entire valve cover assembly, which includes a new gasket, as a preventative measure, especially on cars with over 100,000 miles.
🎬 See this step-by-step walkthrough for replacing the N54 valve cover.Choosing the Right Aftermarket Gasket Set
When shopping for a replacement, you'll find Genuine BMW parts, OEM-supplier parts, and various aftermarket brands. For a critical seal like this, quality matters.
- Tier 1: OEM-Supplier Brands (Reinz, Elwis): Brands like Victor Reinz and Elring (Elwis) are often the original equipment manufacturers for BMW. This means they produce the same part that goes into a BMW box, but sell it under their own name for less. These gaskets offer the best fit and longevity outside of buying a Genuine part.
- Tier 2: Quality Aftermarket (Beck Arnley): These brands often provide reliable parts that meet or exceed OEM specifications. They can be a good balance between cost and quality.
- Tier 3: Budget Brands (URO Parts): URO Parts offers a budget-friendly option. However, forum discussions among BMW owners show mixed experiences, with some reporting fitment issues or premature failure. While some have had success, it's generally seen as a riskier choice for a labor-intensive job like this.
Pro Tip: Many gasket sets come with replacement bolts. The valve cover bolts on the 335i are typically aluminum and designed to be used only once. Always use new bolts when replacing the gasket or cover to ensure proper torque and a lasting seal.
Cost of Replacing Your Valve Cover Gasket
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket Gasket Set | $24 - $85 |
| New OEM Gasket Set | $50 - $100 |
| Shop Labor | $697 - $1,023 |
| Total Professional Repair | $774 - $1,122 |
Frequently Asked Questions
How often does the 335i valve cover gasket need to be replaced?
It varies based on driving conditions, but failure is common between 60,000 and 100,000 miles. The high heat from the turbochargers is a major factor in the gasket's lifespan.
Is this a DIY job?
For an experienced home mechanic, yes. However, it is an involved job that takes several hours and requires removing many components like the cabin air filter housing, strut braces, and fuel injectors. Patience and careful attention to torque specifications are critical.
🎬 Follow this DIY guide for replacing the N55 valve cover.What else should I replace at the same time?
While you have everything apart, it's a good time to inspect and potentially replace your spark plugs and ignition coils, especially if they have been contaminated with oil. If you are only replacing the gasket, you should also get a new gasket for the Valvetronic motor and a new eccentric shaft sensor seal.
Are there any recalls for the valve cover gasket?
No, there are no specific recalls for the valve cover gasket itself, as it is considered a wear-and-tear item. Some owners have reported leaks developing after unrelated recall work that required removing the valve cover, but this is typically due to improper reinstallation.
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Technical Specifications
OEM Part Numbers: 11127565284 11127565286
Kit includes main valve cover gasket and spark plug tube seals. Compatible with N54 and N55 engines depending on the specific part number.
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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.
- BMW 335i: