MERCEDES Engine Motor Mount Box Benz W251

( Manufacturer Part Number: A2512404017 ), ( Mounting Style: Bolt-on ), ( Type: Engine Mount ), ( Manufacturer Warranty: 1 Year ), ( Oe/oem Part Number: A 251 240 40 17 ), ( Universal Fitment: No ), ( Placement On Vehicle: Right, Left )

Review MERCEDES benz Oem Engine Motor Mount New In Box -part# A251 240 4017 fits R350 R500

The **Mercedes-Benz A2512404017 Engine Motor Mount (W251, R350, R500)** is a precision-engineered, high-performance suspension component designed exclusively for the iconic **Mercedes-Benz S-Class (W251)** models, including the **R350 and R500 variants**. This motor mount is a critical part of the vehicle s drivetrain, ensuring optimal engine positioning, vibration dampening, and structural integrity while driving. Crafted from durable, high-grade **rubber and reinforced steel components**, this mount is engineered to withstand the rigorous demands of both daily commuting and high-performance driving, including the dynamic handling characteristics of the R350 and R500 s powerful V8 engines. The design incorporates a **robust mounting bracket system** that securely attaches to the engine block and firewall, providing a stable foundation that minimizes engine movement, reduces noise, and prevents excessive strain on the drivetrain. Whether installed in a standard S-Class or the high-performance **R350 or R500**, this motor mount plays a vital role in maintaining alignment, improving ride comfort, and extending the lifespan of related components such as the exhaust system, transmission, and suspension. Built to Mercedes-Benz s exacting standards, this part is a direct-fit replacement, ensuring seamless integration with the original equipment manufacturer (OEM) specifications, including proper spacing, torque values, and alignment tolerances. Ideal for both professional mechanics and discerning enthusiasts, this motor mount is a must-have for those seeking to restore or maintain the peak performance and reliability of their W251 S-Class, ensuring a smooth, quiet, and efficient driving experience.

### **Pros and Cons of buying a Mercedes-Benz A251 240 4017 Engine Motor Mount (W251 R350/R500 Box)**

1. **Direct Fitment** This motor mount is specifically designed for the **Mercedes-Benz W251 (R350/R500) models**, ensuring compatibility without modifications. It is part of the **A251 240 4017** assembly, which is a common replacement for worn or damaged mounts in these vehicles.

2. **Durability and Quality** Mercedes-Benz OEM (Original Equipment Manufacturer) parts are built to high standards, often using robust materials like reinforced rubber and steel components. This can provide long-term reliability compared to aftermarket alternatives that may wear out faster.

3. **Prevents Excessive Vibration and Noise** A failing motor mount can cause excessive engine movement, leading to rattling, clunking noises, and even damage to surrounding components (e.g., exhaust, suspension). Replacing it with a new OEM mount restores proper engine positioning and reduces vibration.

4. **Maintains Alignment** Properly functioning motor mounts keep the engine in place, ensuring optimal alignment with the transmission and drivetrain. This helps prevent transmission wear and improves overall drivability.

5. **Warranty Coverage** If purchased from an authorized dealer or a reputable supplier, this part may come with a **limited warranty**, offering peace of mind against premature failure.

6. **Easier Installation** Since it is an OEM part, it is designed to fit seamlessly with the existing mounting points, reducing the risk of installation errors that could occur with non-genuine replacements.

7. **Supports Resale Value** Using OEM parts in repairs can help maintain the vehicle s value, especially if the car is being sold or serviced professionally.

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1. **Higher Cost** OEM parts are generally **more expensive** than aftermarket alternatives. The price of the **A251 240 4017 motor mount** may be significantly higher than a third-party equivalent, which could be a deterrent for budget-conscious buyers.

2. **Limited Availability** Depending on the region, OEM parts may not always be readily available at local auto parts stores. Some buyers may need to order it online, which could involve shipping delays.

3. **Potential Counterfeit Risks** If purchasing from an untrusted seller (e.g., eBay, unlicensed online marketplaces), there is a risk of receiving a **counterfeit or refurbished part** that does not meet OEM standards. Always verify the seller s reputation and part authenticity.

4. **Installation Complexity** While the part itself is straightforward, replacing motor mounts often requires **disconnecting components** (e.g., exhaust, wiring harnesses) and may necessitate lifting the vehicle. DIYers without mechanical experience may find the job challenging, potentially leading to additional labor costs if professional help is needed.

5. **Overkill for Minor Issues** If the motor mount is only slightly worn (e.g., minor cracking but no significant movement), some owners may consider **aftermarket or refurbished options** as a cost-effective alternative. Replacing a perfectly functional mount with a new OEM part may be unnecessary in such cases.

6. **Potential for Overpaying** Some aftermarket brands offer **high-quality, OEM-compatible motor mounts** at a fraction of the cost. Researching alternatives (e.g., **Fel-Pro, Dorman, or Eurospec**) could yield similar performance at a lower price.

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The **Mercedes-Benz A251 240 4017 motor mount** is a **reliable, high-quality OEM replacement** for the **W251 R350/R500**, offering durability, proper fitment, and long-term performance. It is the **best choice for owners who prioritize authenticity, warranty coverage, and peace of mind**, especially if the vehicle is being prepared for sale or long-term use.

However, the **higher cost and potential availability issues** make it less ideal for budget-conscious buyers or those dealing with minor wear. In such cases, **vetting aftermarket alternatives** (preferably from reputable brands) could be a more economical solution without sacrificing quality.

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- You want **guaranteed compatibility and longevity**.

- The vehicle is **high-value or being restored**.

- You have **access to an authorized dealer or trusted supplier** to avoid counterfeit parts.

- You are **replacing a severely worn or broken mount** that is causing noticeable vibration or damage.

- You are on a **tight budget** and can find a **high-quality, OEM-compatible mount** (e.g., **Fel-Pro 52000, Dorman 600000, or Eurospec**).

- The mount is **only slightly damaged** and does not require an immediate OEM replacement.

- You are comfortable **researching and verifying** the aftermarket part s reputation before purchasing.

- Always **inspect the mount for cracks, compression, or excessive play** before deciding on replacement.

- If replacing multiple mounts, consider **upgrading to reinforced or high-performance mounts** (e.g., **Fel-Pro s "Heavy Duty" series**) for better durability.

- If unsure about installation, **consult a Mercedes-Benz specialist** to avoid improper fitting, which could lead to further issues.

**Final Verdict:** For most **W251 R350/R500 owners facing a failed motor mount**, the **A251 240 4017 OEM part remains the safest and most reliable choice**, despite the higher cost. However, those looking to save money should explore **trusted aftermarket options** that meet or exceed OEM standards.

Details:

Mercedes part # A251 240 40 17 OEM Mercedes-Benz Part not aftermarket. New, sealed in box motor mount for 2006 2012 OEM Mercedes-Benz R-Class - R350, R500.

part #: a2512404017 prices

• $87.00-$149.99

specifications engimou:

• for models: R350, R500
• for makes: Mercedes
• mpn: A2512404017
• mounting style: Bolt-on
• type: Engine Mount
• manufacturer warranty: 1 Year
• oe/oem part number: A 251 240 40 17
• universal fitment: No
• placement on vehicle: Right, Left

general engimou:

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

seller engimou:

• city: Scranton, Pennsylvania
• # reviews: 52
• rating: 100.0%

offer engimou:

• sold: 0
• best offers: True
• availability: In Stock
• options: Ship-to-home
• quantity: 1
• started: April 4, 2026

payments engimou:

• money order
• credit card: Mastercard
• wallet: Google-pay
• other

returns engimou:

• policy: No Returns

shipping engimou:

• carrier: USPS
• service: USPS Ground Advantage
• type: Calculated
• transit: 5-10 Days
• class: Standard
• cost: $0.00

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