A Guide to Replacing the Engine Valve Cover Gaskets on the 2008-2012 BMW M3
Leaking valve cover gaskets are a common problem on the S65 V8 engine; this guide explains how to choose the right parts for the job.
- Leaking valve cover gaskets are a very common issue on the S65 V8 due to engine heat degrading the rubber seals.
- Symptoms include a burning oil smell, smoke from the engine bay, and potential engine misfires if oil fouls the spark plugs.
- Always replace gaskets for both cylinder banks at the same time, along with spark plug tube seals and consider replacing the valve cover bolts.
- Choose high-quality aftermarket brands like Victor Reinz or Elring for a reliable, long-lasting repair.
Signs of a Failing Valve Cover Gasket
A leaking valve cover gasket on the S65 engine is a common issue that shouldn't be ignored. The first sign most owners notice is the smell of burning oil. This happens when oil drips from the valve cover onto the hot exhaust manifolds below and burns off. You may see smoke coming from the engine bay, especially when stopped at a light. Another clear symptom is visible oil residue on the side of the engine block, just below the valve covers. In more advanced cases, oil can leak into the spark plug tubes, fouling the spark plugs and ignition coils. This can cause engine misfires, a rough idle, and the Check Engine Light to come on.
Known Issues with S65 Valve Covers
The original magnesium valve covers on the S65 engine are known to be porous and can degrade over time. This can lead to oil seeping directly through the cover itself, not just the gasket. The paint is also known to bubble and flake off, which can allow oil to weep from behind the paint. When replacing the gaskets, carefully inspect the covers for corrosion or degradation. Some owners opt for aftermarket aluminum valve covers for a long-term solution.
🎬 Watch: A detailed video guide on replacing S65 valve cover gaskets.Choosing the Right Aftermarket Gasket Set
When shopping for a replacement, you have several options. Since the S65 has two valve covers, you will need a gasket for each side (Bank 1 and Bank 2). Many aftermarket kits include both gaskets, plus new spark plug tube seals and grommets for the mounting bolts.
- Premium Aftermarket (OEM-Quality): Brands like Victor Reinz and Elring are often original equipment suppliers to BMW and other German automakers. They offer high-quality gaskets that are designed to fit and perform like the original parts. Many experienced owners and mechanics recommend sticking with these brands for reliability.
- Performance Aftermarket Kits: Brands like NRW Design offer comprehensive kits made from high-temperature Viton rubber, which may offer longer life than the standard material. These kits often include upgraded components like billet aluminum spark plug tubes and silicone grommets.
- Budget Aftermarket: While cheaper options are available, they are often not recommended for this specific job. A leaking gasket on the S65 can cause significant issues, and the labor involved in a replacement is considerable. Using a low-quality gasket that fails prematurely will lead to repeating the repair.
What Else to Replace
Since this job requires removing the intake plenum and other components, it's a good time to perform other maintenance. Consider replacing the spark plugs, ignition coils (if old), and camshaft position sensors and their O-rings. It is also highly recommended to replace the valve cover mounting bolts, as the integrated grommets can crack and leak.
| Part Type | Estimated Cost |
|---|---|
| New OEM Gasket Set | $150 - $250 |
| New Aftermarket Gasket Set | $80 - $400 |
| Shop Labor | $650 - $1200 |
Frequently Asked Questions
Is this a difficult job for a DIY mechanic?
This is a moderately difficult job. While it doesn't require highly specialized tools, accessing the valve covers on the S65 V8 is time-consuming. It involves removing the intake plenum, airbox, and various electrical connectors and hoses. Careful cleaning of the sealing surfaces and proper torquing of the new bolts are critical for a leak-free result. Expect the job to take 4-6 hours.
🎬 Watch this comprehensive DIY walkthrough for the full replacement process.Do I need to use sealant on the new gaskets?
Yes, a small amount of gasket sealant (like Drei Bond or a similar product) is recommended at specific points. This is typically applied where the timing cover meets the cylinder head to ensure a perfect seal at the corners.
🎬 See a step-by-step guide on replacing gaskets and applying sealant.Should I replace both valve cover gaskets at the same time?
Yes. The gaskets are made of the same material and exposed to the same conditions. If one has failed due to age and heat, the other is likely to fail soon. Given the amount of labor required to access them, it is highly recommended to replace both at once.
Are there any recalls for the valve cover gaskets?
No, there are no recalls or Technical Service Bulletins (TSBs) specifically for leaking valve cover gaskets on the 2008-2012 BMW M3. Recalls for this vehicle have focused on issues like airbags and battery cable connections.
Helpful Videos
Technical Specifications
OEM Part Numbers: 11127838271 11127838272 11127841217
Kit includes two main valve cover gaskets (Bank 1 & Bank 2), spark plug tube seals, and often camshaft sensor seals and bolt grommets.
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 M3: