BMW Right Engine Mount 343.BM1S08 3.0L

( Part Type: Engine Mount ), ( Conditions Options: 3.0 Rh Engine Mount ), ( Genuine Oem: Yes ), ( Ipn: 343.bm1s08 )

Review BMW Sedan 3.0l Right Engine Mount fits 328I 2008

The **BMW 343.BM1S08 3.0L Right Engine Mount** is a critical component of the iconic N54 engine bay, designed specifically for the 2008 BMW 328i models equipped with the high-performance inline-six powerplant. This engine mount is engineered to provide robust structural support while absorbing vibrations and shocks generated by the 3.0-liter twin-turbocharged engine, ensuring optimal alignment and longevity of the drivetrain. Crafted from high-grade rubber and reinforced with durable polymer materials, this mount is built to withstand the intense forces produced by the N54 s aggressive power delivery, which includes peak torque figures of up to 273 lb-ft (370 Nm) and a redline exceeding 7,500 RPM. The design incorporates precise mounting points that interface seamlessly with the engine s right-hand side, anchoring it securely to the vehicle s subframe while allowing for controlled movement during acceleration, braking, and cornering. This particular mount is essential for maintaining proper engine positioning, preventing excessive sway or lateral movement that could lead to drivetrain misalignment, premature wear on suspension components, or even catastrophic failure in extreme conditions. For enthusiasts seeking to restore or upgrade their 328i s engine bay, this OEM-quality right engine mount is a must-have replacement, ensuring compatibility with aftermarket modifications such as cold air intakes, exhaust systems, or performance tuning. Its robust construction and precise engineering make it a reliable choice for both daily driving and spirited performance applications, reinforcing the N54 s reputation for durability and responsiveness.

### Pros and Cons of Buying a 2008 BMW 343i (E90) with a 3.0L Right Engine Mount Issue

#### **Pros**

1. **Performance and Driving Dynamics**

The 2008 BMW 343i (E90) is powered by the N52 3.0L inline-six engine, which delivers strong performance with 258 horsepower and 229 lb-ft of torque. This engine provides a balanced mix of power and efficiency, making it enjoyable for both city driving and highway cruising. The E90 chassis is well-tuned for handling, offering a sporty and engaging driving experience, especially with minor suspension upgrades.

2. **Reliability of the N52 Engine**

The N52 engine is generally reliable when properly maintained. With regular oil changes (using high-quality synthetic oil) and attention to minor wear items like timing chain tensioners and water pump seals, this engine can last well beyond 100,000 miles. The 3.0L inline-six is less prone to catastrophic failure compared to some other BMW engines of its era, particularly if it has been well cared for.

3. **Aftermarket Support and Modifications**

The E90 platform is one of the most popular BMW models for modifications, with a vast array of aftermarket parts available. Owners can easily upgrade components such as suspension, exhaust, intake, and ECU tuning to enhance performance, handling, and sound. The availability of parts and tuning solutions makes it easier to tailor the car to personal preferences.

4. **Comfort and Practicality**

The 343i offers a comfortable ride, especially with the optional adaptive suspension or aftermarket upgrades. It provides ample interior space for passengers and cargo, with a practical trunk size and a spacious cabin. The interior is well-appointed with premium materials, including options like leather seats, wood trim, and advanced infotainment systems (depending on the trim level).

5. **Resale Value and Community**

The E90 3-series remains a desirable model in the used market, particularly among BMW enthusiasts. This ensures a relatively strong resale value compared to some other luxury compacts. Additionally, there is a large and active community of E90 owners and enthusiasts who share knowledge, modifications, and support, making it easier to find help or advice when needed.

6. **Fuel Efficiency**

The N52 engine offers decent fuel efficiency for a sporty sedan, averaging around 18-22 MPG in the city and 25-28 MPG on the highway, depending on driving conditions and maintenance. This is competitive with many other luxury sedans in its class.

---

#### **Cons**

1. **Right Engine Mount Failure**

The most significant issue with this particular 2008 343i is the failure of the right engine mount. Engine mounts are critical components that support the engine and prevent excessive vibration and movement. A failing right engine mount can lead to:

- Excessive engine noise and vibration, which can be uncomfortable and distracting.

- Potential damage to other engine components due to misalignment or excessive movement.

- A rough or unstable ride, particularly at higher speeds or when accelerating.

- In severe cases, the mount could fail completely, causing the engine to drop and potentially damage the oil pan or other undercarriage components.

Replacing the right engine mount is a relatively straightforward job, but it requires careful attention to ensure proper alignment and torque specifications. The cost of parts and labor can range from $300 to $800, depending on whether you use OEM or aftermarket parts and whether you perform the work yourself or at a shop.

2. **Maintenance Costs**

BMWs, especially those with higher performance or luxury features, can be expensive to maintain. Regular maintenance such as oil changes, timing belt replacements (if applicable), and other scheduled services can add up. The N52 engine does not require a timing belt replacement, but other wear items like water pump seals, tensioners, and gaskets may need attention over time. Ignoring maintenance can lead to more costly repairs down the road.

3. **Common Wear Items**

- **Water Pump and Thermostat:** The water pump and thermostat housing are prone to leaks, especially if the car has been driven hard or not maintained properly. Replacing these components is a labor-intensive job that can cost $500-$1,200.

- **Timing Chain Tensioners and Guide:** While the N52 does not have a timing belt, the timing chain tensioners and guide can wear out and cause rattling noises or timing issues. Replacing these is recommended if they show signs of wear.

- **Suspension Components:** The E90 s suspension can wear out over time, particularly the control arms, bushings, and sway bar links. Replacing these components can improve handling but adds to the maintenance cost.

- **Brake System:** The E90 s brake system, especially the calipers and rotors, can wear out quickly if the car is driven aggressively. Brake jobs can be costly but are necessary for safety.

4. **Electrical and Infotainment Issues**

The E90 s infotainment system, particularly in older models, can be prone to glitches, software issues, or hardware failures. The iDrive interface may freeze or become unresponsive, and Bluetooth connectivity can be unreliable. While these issues are not critical for safety, they can be frustrating and may require professional attention or software updates.

5. **Rust and Corrosion**

Depending on the car s history and climate, rust can be a concern, particularly in areas like the wheel wells, rocker panels, and undercarriage. A thorough inspection of these areas is essential to avoid costly repairs later.

6. **Depreciation**

While the E90 retains some value, luxury vehicles generally depreciate quickly. A 2008 model will have lost a significant portion of its original value, and further depreciation can be expected over time. This means that the car may not hold its value as well as some other investments.

7. **Noise and Vibration**

- **Valvetronic Motor Noise:** The Valvetronic system, which controls intake airflow, can develop rattling noises if the motor or related components fail.

- **Exhaust Manifold Leaks:** The exhaust manifolds can develop cracks or leaks, leading to hissing noises and reduced performance.

- **Intake Noise:** The air intake system can develop rattles or leaks, particularly if the plastic components degrade over time.

---

#### **Conclusion**

Buying a 2008 BMW 343i (E90) with a 3.0L N52 engine and a failing right engine mount can be a rewarding experience if approached with caution and a clear understanding of the potential issues. The car offers strong performance, engaging driving dynamics, and a solid engine that can last for many miles with proper maintenance. However, the right engine mount issue is a critical factor that cannot be overlooked. Addressing this problem promptly is essential to avoid further damage and ensure a smooth driving experience.

The E90 platform is well-suited for enthusiasts who enjoy modifying and tuning their cars, and the strong aftermarket support makes it easier to customize and maintain. That said, the car s maintenance costs, common wear items, and potential electrical issues should be factored into the decision. If you are prepared to invest time and money into regular maintenance and are comfortable with addressing issues like the engine mount or other wear items, the 343i can be a fantastic choice.

---

#### **Recommendation**

1. **Inspect the Right Engine Mount**

Before buying, have a trusted mechanic inspect the right engine mount for signs of wear, cracks, or failure. Ensure that the mount is securely attached and that there is no excessive play or movement. If the mount is already failing, factor in the cost of replacement (parts and labor) into your budget.

2. **Review Maintenance Records**

Request the car s full maintenance history, including oil changes, timing chain inspections, water pump replacements, and any other services performed. A well-maintained E90 will have a longer lifespan and fewer issues. Be wary of cars with incomplete or missing maintenance records.

3. **Check for Common Wear Items**

Have the car inspected for common wear items such as water pump leaks, timing chain tensioners, suspension components, and brake system health. Addressing these issues upfront can save you money and headaches in the future.

4. **Test Drive and Listen for Issues**

During the test drive, pay close attention to engine noise, vibration, and handling. Listen for unusual rattles, hissing sounds, or changes in engine behavior that could indicate underlying problems.

5. **Budget for Maintenance and Modifications**

Set aside a budget for regular maintenance and potential repairs. The E90 is a fun car to own, but it requires attention to stay in good condition. Consider setting aside $1,000-$2,000 annually for maintenance and unexpected repairs.

6. **Consider Professional Assistance**

If you are not comfortable performing maintenance or repairs yourself, factor in the cost of labor. BMW dealerships and specialized mechanics can provide high-quality service but may charge premium prices. Alternatively, independent

Details:

Computers/Modules/Airbags/Radios may require dealer programming to be functional in your vehicle. Left Driver Door Trim Panels are trim panel only without switches. Wheels are rim only. Doors are door only.

Please message first. Engines do not include starter, throttle body, alternator, injectors, intake exhaust manifolds or ac pump. Wiper motors and linkage are sold separately unless indicated differently in the listing. Fuel cap is only, filler door sold separately.

Confirm trim and paint codes prior to purchase. No switches, airbags, airbag covers. Monitors can look different than actual color. Does not include Tire, Hubcap.

Fuel rail may differ. Window regulators motors are sold separately unless indicated differently in the listing. Lower dash panels do not include switches. Does not include Tire or cap.

Bezel is not included. 3.0 RH ENGINE MOUNT. Consoles are sold without lids and bare. Shift Assembly does not include cable or bezel.

Does not include shift assembly or parking brake levers switches. Shift Assembly and emergency brake lever does not include cable or bezel. Steering Wheels and columns are bare.

part #: 328i prices

• $25.09-$27.00

specifications engimou:

• for models: 328i
• for makes: Bmw
• for years: 2008
• part type: Engine Mount
• conditions options: 3.0 Rh Engine Mount
• genuine oem: Yes
• ipn: 343.bm1s08

returns engimou:

• policy: Returns Accepted
• paid by: Buyer
• time: 30 Days

offer engimou:

• options: Ship-to-home
• started: April 20, 2026
• sold: 0
• availability: In Stock
• quantity: 1

payments engimou:

• other
• wallet: Apple-pay
• credit card: Visa

seller engimou:

• rating: 99.6%
• # reviews: 9601
• city: Fairmount, Indiana

shipping engimou:

• carrier: USPS
• class: Standard
• cost: $0.00
• transit: 3-8 Days
• type: Fixed
• service: USPS Ground Advantage

general engimou:

• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Engine Mounts

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