2015-2019 BMW X4 Engine Valve Cover Gasket Set: A Comprehensive Guide
Leaking oil and a burning smell are common signs your BMW X4 needs a new valve cover gasket.
- A burning oil smell is the most common sign of a failing valve cover gasket on the X4.
- Due to the plastic valve cover's tendency to warp or crack, replacing the entire cover assembly is often recommended over just the gasket, especially for vehicles with over 75,000 miles.
- Choose high-quality aftermarket brands like Victor Reinz or Elring, which are often OEM suppliers, to avoid premature failure and repeating the repair.
- While replacing the gasket, it is a good idea to also replace the spark plugs and inspect the brittle crankcase vent hose.
Is Your BMW X4 Leaking Oil? Understanding Valve Cover Gasket Failure
A burning oil smell is one of the first signs a BMW X4 owner notices when the valve cover gasket fails. This happens because oil leaks from the brittle gasket and drips onto the hot exhaust manifold, where it instantly burns off. You might also see visible oil weeping around the top of the engine, particularly on the passenger (exhaust) side, or notice smoke coming from under the hood when stopped. If the leak is severe, oil can pool in the spark plug wells, causing engine misfires, a rough idle, and a Check Engine Light.
Why You Shouldn't Wait
Ignoring a leaking valve cover gasket can lead to more serious issues. A constant oil leak can lower your engine's oil level, risking engine damage. Leaking oil can also damage other rubber and plastic components like belts and hoses, and can even pose a fire risk if enough oil accumulates on the hot exhaust.
Choosing the Right Aftermarket Gasket Set
When replacing the valve cover gasket, you have a choice between original equipment (OEM) and aftermarket parts. For a critical seal like this, quality matters. BMW's plastic valve covers can become brittle and warp over time, so many mechanics recommend replacing the entire valve cover assembly, not just the gasket, especially on higher-mileage vehicles.
Aftermarket Brand Tiers for BMW X4
- Tier 1 (OEM Quality): Brands like Victor Gaskets (Victor Reinz) and Elwis (Elring) are often original equipment suppliers to BMW. Choosing these brands typically ensures a perfect fit and long-lasting materials comparable to the dealer part, but at a lower cost. Many experienced BMW technicians recommend these brands.
- Tier 2 (Reputable Aftermarket): Beck Arnley is a parts sourcing company. They don't manufacture the parts themselves, but package and sell parts from various manufacturers, which can include OEM suppliers. Quality can be good, but it's not always guaranteed to be from the original manufacturer.
- Tier 3 (Budget-Focused): URO Parts has a mixed reputation in BMW communities. While some of their parts offer a budget-friendly solution, they are often associated with fitment issues and lower durability compared to OEM or Tier 1 brands. For a job this labor-intensive, many owners and mechanics suggest avoiding budget brands to prevent having to do the job twice.
Pro Tip: Gasket Only or Full Cover Replacement?
On BMWs with the N20, N55, and B46 engines, the PCV (Positive Crankcase Ventilation) system is often integrated into the plastic valve cover. When this system fails, it can cause similar symptoms to a bad gasket. Because the plastic cover itself can crack or warp from heat cycles, replacing the entire valve cover assembly with a new gasket is often the most reliable long-term repair, especially if your X4 has over 75,000 miles.
Cost of Replacing a BMW X4 Valve Cover Gasket
The cost can vary significantly based on whether you replace just the gasket or the entire cover, and whether you do it yourself or use a professional shop.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Gasket Set | $25 - $84 |
| New OEM Gasket Set | $65 - $90 |
| New Aftermarket Valve Cover (with Gasket) | $150 - $400 |
| New OEM Valve Cover (with Gasket) | $450 - $700+ |
| Shop Labor | $622 - $913 |
Frequently Asked Questions
Can I just tighten the bolts on the valve cover to stop the leak?
No, this is not recommended. The gasket fails because the rubber becomes hard and brittle; it no longer has the flexibility to seal properly. Over-tightening the bolts can crack the plastic valve cover, leading to a much more expensive repair. The bolts should be tightened to a specific, low torque setting in a specific sequence.
Is this a good DIY project for a beginner?
This job is considered intermediate to advanced. It requires removing many components to access the valve cover, including the cabin air filter housing, engine braces, and fuel lines. It requires careful work around sensitive electronics and fuel systems. While it is a feasible DIY for an experienced home mechanic, it is likely too complex for a beginner.
How long does a valve cover gasket last on a BMW X4?
Valve cover gaskets on modern BMWs often fail due to high engine temperatures. It is common to see leaks appear anywhere from 70,000 to 100,000 miles. Cars that are frequently driven in stop-and-go traffic or in hot climates may experience failure sooner.
What else should I replace at the same time?
While you have everything apart, it's a great time to inspect and replace the spark plugs and ignition coils, especially if they have been contaminated with oil. Also, inspect the crankcase vent hose, as it becomes very brittle and often breaks during removal. Many owners choose to replace it proactively.
Technical Specifications
OEM Part Numbers: 11127588418 11127587804
The 2015-2019 BMW X4 uses different valve cover gaskets depending on the engine. The xDrive28i (2015-2018) and xDrive30i (2019) use a gasket for the 4-cylinder N20/B46 engines (OEM part number often references 11127588418). The xDrive35i and M40i models use a gasket for the 6-cylinder N55 engine (OEM part number often references 11127587804). Always verify fitment with your vehicle's specific engine.
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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 X4:
- 🛍️ Shop This Part
- Is Your BMW X4 Leaking Oil? Understanding Valve Cover Gasket Failure
- Why You Shouldn't Wait
- Choosing the Right Aftermarket Gasket Set
- Aftermarket Brand Tiers for BMW X4
- Pro Tip: Gasket Only or Full Cover Replacement?
- Cost of Replacing a BMW X4 Valve Cover Gasket
- Frequently Asked Questions
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