A Guide to the Engine Valve Cover Gasket on a 2007-2011 BMW 320i (E90)
Understanding the common oil leaks on your BMW 320i and how to choose the right replacement gasket.
- The 2007-2011 BMW 320i (E90) was not sold in the North American market, so parts are specific to the N43/N46 engine.
- Common symptoms of failure are a burning oil smell, visible leaks on the engine, and oil in the spark plug wells causing misfires.
- Consider replacing the entire plastic valve cover, as it can crack with age; a new cover often includes a new gasket and bolts.
- For a standalone gasket, choose a high-quality aftermarket brand like Elring, Febi Bilstein, or Mahle for a reliable seal.
Important Note for North American Owners
The BMW 320i from the 2007-2011 model years (part of the E90 generation) was equipped with the N43 or N46 four-cylinder engine. These specific models were not sold in the US or North American markets. In North America, the available 3-Series models for these years were primarily the 328i and 335i, which use different six-cylinder engines (N52, N54, N55). This guide is specific to the 320i (N43/N46 engine), so part numbers and some brand availability will differ from the North American 3-Series models.
Symptoms of a Failing Valve Cover Gasket
A leaking valve cover gasket is one of the most common oil leaks on the E90 320i. The signs are usually easy to spot if you know what to look for.
- Burning Oil Smell: This is often the first symptom owners notice. Oil drips from the leaking gasket onto the hot exhaust manifold, where it burns off and creates a distinct, unpleasant smell that you might notice inside or outside the car, especially after a drive.
- Visible Oil Leaks: You may see a dark, wet residue or active oil drips on the side of the engine. On these engines, the leak is common on the exhaust side. You might also find small puddles of oil on the ground where you park, though the under-engine splash shield can sometimes hide these drips.
- Oil on Spark Plugs and Ignition Coils: The valve cover gasket set includes seals for the spark plug tubes. When these fail, oil leaks into the spark plug wells. This can ruin the ignition coils and cause the engine to misfire.
- Rough Idle and Misfires: If oil contaminates the spark plugs, it can cause poor engine performance, a rough idle, hesitation when accelerating, and the check engine light to come on.
Choosing the Right Aftermarket Gasket Set
When it's time to replace your gasket, you have a choice between original BMW parts and aftermarket brands. For a simple part like a gasket, a high-quality aftermarket brand can offer the same performance for less money.
Pro Tip: Many experienced mechanics and DIYers recommend replacing the entire valve cover, not just the gasket. The plastic valve covers on these engines can become brittle and develop hairline cracks over time. A new cover often includes a new gasket and bolts, solving potential problems before they start.
Top-Tier Aftermarket Brands (OEM-Quality)
These brands are often the original equipment manufacturers for BMW or are known for producing parts of equivalent quality.
- Elring: A well-regarded German brand that is often an OEM supplier. Many mechanics trust Elring for a reliable seal. However, some technicians have reported a higher failure rate with their complete valve cover assemblies compared to genuine BMW parts. For just the gasket, it is a solid choice.
- Febi Bilstein: Another top German brand with a strong reputation for quality parts that fit correctly.
- Mahle: Known for high-quality engine components and is also an OEM supplier for BMW.
Mid-Tier & Budget Brands
While more affordable, quality can be inconsistent. Some brands may have fitment issues or use materials that don't last as long as their top-tier counterparts.
- Victor Reinz: This is a well-known brand, but many professional mechanics advise against using their gaskets for BMWs, citing fitment problems and premature leaks.
- Store Brands & Unbranded Kits: Generic kits from online marketplaces or auto parts stores are the cheapest option, but they are a gamble. The quality of the rubber and the precision of the molding can be poor, leading to a bad seal and forcing you to do the job again sooner than you'd like.
Estimated Replacement Costs
Costs can vary based on your location and the shop you choose. The prices below are estimates for the 2007-2011 BMW 320i.
| Part / Service | Estimated Cost (USD) |
|---|---|
| New OEM Gasket Set | $80 - $130 |
| New Aftermarket Gasket Set (Top-Tier) | $30 - $60 |
| Shop Labor | $560 - $825 |
| Total Professional Replacement | $640 - $955 |
Frequently Asked Questions (FAQ)
Are there any recalls for the 2007-2011 BMW 320i valve cover gasket?
No, there are no specific recalls from BMW or NHTSA for the valve cover gasket on this vehicle. There have been recalls for other issues on the E90 3-Series, such as the PCV valve heater and battery cable connectors, but not the gasket itself.
Should I use sealant on the new gasket?
Most high-quality gaskets are designed to be installed dry. However, it is standard practice to apply a small amount of sealant (like Permatex Ultra Black) at the sharp corners and seams, such as where the timing cover meets the cylinder head, to prevent small leaks. Do not coat the entire gasket in sealant.
Is this a difficult DIY job?
For an experienced DIYer, this job is manageable but time-consuming. It requires removing several components to access the valve cover, including the engine covers, wiring harnesses, and potentially the Valvetronic motor. It's crucial to follow the correct bolt tightening sequence and torque specifications to avoid cracking the cover or causing a new leak. A beginner should likely leave this job to a professional.
🎬 Watch a step-by-step guide on replacing the valve cover gasket.Should I replace the valve cover bolts?
If your engine has aluminum valve cover bolts, they are one-time use and MUST be replaced. They are designed to stretch when torqued and will not seal properly if reused. Always check the requirements for your specific engine, as some may use steel bolts that can be reused.
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Technical Specifications
This gasket set is designed for the BMW N43 or N46 4-cylinder engines used in the E90 chassis. The set typically includes the main perimeter gasket and spark plug tube seals.
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 320i: