A Guide to Suspension Shock and Strut Mounts for the 2008-2013 BMW M3
Restore your M3's sharp handling and ride quality by addressing worn suspension mounts.
- The most common sign of failure is a clunking noise over bumps or when turning.
- Verify if your M3 has EDC suspension before ordering rear mounts to ensure you get the correct part.
- Always replace mounts in pairs (both front or both rear) to maintain balanced handling.
- A wheel alignment is necessary after replacing front strut mounts to prevent tire wear and ensure proper handling.
Symptoms of Failing M3 Shock and Strut Mounts
Worn suspension mounts on an E9x M3 can make the car feel less precise and generate noise. Because they wear out gradually, you might not notice the change until it becomes severe. Look for these common signs:
- Clunking or Knocking Noises: This is the most common symptom. You may hear a clunk, pop, or creak from the front or rear suspension when driving over bumps, potholes, or even just turning the wheel at low speeds.
- Increased Vibration: You might feel more vibration through the steering wheel or the floor of the car. A worn mount can no longer absorb road harshness effectively.
- Poor Steering Response: The steering may feel vague, loose, or less responsive. In some cases, the steering wheel might not return to center properly after a turn.
- Uneven Tire Wear: Bad mounts can throw off your M3's wheel alignment, leading to accelerated or uneven wear on your tires.
- Visible Wear: If you inspect the mounts, you may see cracked, separated, or compressed rubber. For the front mounts, you might see the top of the strut has shifted or has excessive play in the engine bay.
Common Ordering Mistake: Check for EDC
The 2008-2013 M3 was available with standard suspension or Electronic Damper Control (EDC). The rear shock absorbers are different between these two systems. Non-EDC shocks have a 10mm shaft, while EDC shocks have a 14mm shaft. You MUST order rear shock mounts that match your specific system. Using the wrong mount will prevent installation. Always verify if your car has EDC before ordering rear mounts.
Choosing the Right Aftermarket Mounts for Your M3
For a high-performance car like the E92 M3, the quality of suspension components matters. While original BMW parts are always a safe bet, aftermarket options can offer good quality, often at a better price. Here’s a look at the available brands.
Brand Quality Tiers
- KYB: KYB is a well-respected Japanese manufacturer that is also an OEM supplier for many car brands. Their aftermarket parts are known for quality and reliability that is often equivalent to the original parts. For an M3 owner looking for a dependable, stock-like replacement, KYB is a strong choice.
- Mevotech: Mevotech offers a wide range of chassis parts and often positions its products as durable, standard replacements. While not specifically known as a high-performance brand, their parts can be a suitable option for daily driving.
- DEA Strut: DEA is typically known as a budget-friendly brand. While this can be appealing for cost savings, for a vehicle like the M3 where handling and performance are key, installing a budget part in a critical suspension area could compromise the driving dynamics the car is known for.
Pro Tip: Replace in Pairs
It is always recommended to replace suspension mounts in pairs (both fronts or both rears). Since they wear at a similar rate, if one has failed, the other is likely not far behind. Replacing them together ensures balanced handling and saves you from doing the same job twice.
Cost of Replacing M3 Suspension Mounts
The cost can be broken down into parts and labor. Rear shock mounts are generally less expensive and easier to install than front strut mounts.
| Item | Cost Range |
|---|---|
| New Aftermarket Mounting Kit (per corner) | $24.76 - $33.62 |
| New OEM Mounting Kit (per corner) | $75 - $150 |
| Shop Labor (Front, per side) | $200 - $400 |
| Shop Labor (Rear, per side) | $100 - $200 |
Frequently Asked Questions
Do I need a wheel alignment after replacing the mounts?
Yes. Replacing the front strut mounts will affect your wheel alignment. You should have a professional four-wheel alignment performed after the job is complete to ensure proper handling and prevent uneven tire wear. Replacing only the rear mounts may not always require an alignment, but it is good practice to check.
Can I replace just the rubber part of the mount?
No. Suspension shock and strut mounts are sold as complete units. The rubber is bonded to the metal structure, and they cannot be serviced separately. The entire mount assembly must be replaced.
Are there any recalls for M3 suspension mounts?
No. While there have been recalls for the 2008-2013 BMW M3 for issues like airbags and battery cables, there are no official recalls from BMW or the NHTSA for failing shock or strut mounts.
Should I upgrade to stiffer performance mounts?
It depends on your driving style. Stiffer polyurethane or solid mounts can improve steering response and feel, which is great for track use. However, they will also transmit more noise and vibration into the cabin, making the ride harsher for daily driving. For most owners, a quality OEM-equivalent mount provides the best balance of performance and comfort.
Technical Specifications
OEM Part Numbers: Front Strut Mount (Guide Support): 31302283635 Rear Upper Shock Mount (Guide Support): 33502283639 Rear Lower Shock Mount (non-EDC): 33506771738 Rear Lower Shock Mount (EDC): 33522283407
Vehicle Fitment: 2008, 2009, 2010, 2011, 2012, 2013 BMW M3 (E90, E92, E93 chassis). Front mounts are universal. Rear mounts are specific to EDC or non-EDC suspension.
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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.
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