MERCEDES 2740300900 Engine Connecting Rod Piston Set 151617181920 Benz W213 M274

( Manufacturer Part Number: 2740300900 ), ( Part Type: Engine Rod Piston ), ( Oe/oem Part Number: A2740300900, A2740300417, A2740303400, A2740300400, A2700300120 ), ( Country Of Origin: Germany ), ( UPC: 151617181920 )

Review MERCEDES benz Engine Connecting Rod Piston Set Oem fits E300 SLC300 C300 2015–2020

The **Mercedes-Benz 2740300900 Engine Connecting Rod and Piston Set** is a high-performance, precision-engineered component designed exclusively for the **W213 E300 SLC300 (C300) models** produced between **2011 and 2020**, featuring the **M274 3.0L inline-six (I6) engine** with a **3.0L displacement and turbocharged (TwinScroll) induction system**. This critical aftermarket replacement set is meticulously crafted to restore or enhance the internal combustion efficiency of this iconic luxury sedan, ensuring optimal power delivery, reliability, and longevity. The **connecting rod and piston assembly** is forged from **high-grade aircraft-quality aluminum (for pistons) and heat-treated forged steel (for connecting rods)**, guaranteeing superior strength, durability, and resistance to thermal stress and wear critical factors in maintaining peak performance under the demanding conditions of modern driving, including aggressive acceleration, high-RPM operation, and extended turbocharged boost cycles. Each piston is **hypereutectic in construction**, featuring a **dished top design** to optimize combustion chamber efficiency and reduce knock sensitivity, while the **forged steel connecting rods** incorporate **precision-machined small and large ends** with **oil holes** for consistent lubrication, minimizing friction and preventing premature failure. This set is engineered to **match or exceed OEM specifications**, ensuring a seamless fit with the stock crankshaft, bearings, and cylinder walls, while also accommodating aftermarket upgrades such as **forged pistons, high-flow turbochargers, or increased boost pressures** for those seeking enhanced performance. Whether used for **restoration projects, high-mileage engine rebuilds, or performance modifications**, this connecting rod and piston set is a **direct-fit, no-compromise solution** that delivers the structural integrity and performance potential required to keep the M274 engine running at its best whether for daily driving, spirited cruising, or competitive track use. Built to the same rigorous standards as Mercedes-Benz s original components, this aftermarket part is backed by **comprehensive engineering validation** to ensure compatibility with the engine s internal geometry, valve timing, and fuel delivery systems, making it an ideal choice for both professional mechanics and enthusiasts who demand nothing less than perfection in their vehicle s powerplant.

### **Pros and Cons of Buying a Mercedes-Benz W213 E300 SLC300 (M274 Engine) Connecting Rod & Piston Set (Part Number: 2740300900, 15-20 Model Years)**

1. **Performance Improvement** A high-quality connecting rod and piston set can enhance engine efficiency, power output, and responsiveness, especially if the original components are worn or damaged.

2. **Durability and Longevity** New or aftermarket rods and pistons are often forged from stronger materials (e.g., aluminum alloys or steel), reducing the risk of catastrophic failure compared to worn-out OEM parts.

3. **Compatibility with Modifications** If you plan to increase compression ratios, turbocharging, or forced induction, upgraded rods and pistons are essential to prevent engine damage.

4. **Reduced Engine Noise and Vibration** Well-matched rod and piston assemblies can improve smoothness, reducing knocking and excessive vibration.

5. **Warranty and Reliability** Reputable manufacturers (e.g., Mahle, Wagner, or OEM replacements) offer warranties, ensuring long-term reliability if installed correctly.

6. **Potential for Increased Horsepower** In combination with other upgrades (e.g., headers, ECU tuning), a stronger piston and rod set can allow for more aggressive modifications without risking engine destruction.

7. **Preventative Maintenance** If your engine shows signs of wear (oil consumption, compression loss, or knocking), replacing rods and pistons proactively can avoid costly repairs.

1. **High Cost** A quality connecting rod and piston set is expensive, often costing **$1,500 $3,000 ** depending on brand and whether it includes additional components (e.g., rings, bearings).

2. **Labor-Intensive Installation** Requires a full engine teardown, which is labor-intensive and time-consuming, adding to the total cost.

3. **Risk of Improper Installation** If not installed correctly, there s a chance of misalignment, which could lead to engine damage or premature failure.

4. **Potential for Overkill** If your engine is in good condition and not heavily modified, upgrading rods and pistons may not be necessary, making the investment unnecessary.

5. **Compatibility Issues** Some aftermarket sets may not fit perfectly with stock crankshafts or other internal components, requiring additional modifications.

6. **Warranty Void Risk** If the vehicle is under warranty, installing aftermarket parts (even if OEM-spec) may void certain coverage.

7. **Alternative Solutions Exist** In some cases, simpler fixes (e.g., valve adjustments, oil changes, or minor repairs) may address performance issues without a full rebuild.

---

### **Conclusion**

A **Mercedes-Benz W213 E300 SLC300 (M274 engine) connecting rod and piston set (2740300900)** is a **significant upgrade** that justifies the cost if:

- Your engine shows **mechanical wear** (knocking, oil consumption, low compression).

- You plan **forced induction or aggressive modifications**.

- You want **long-term reliability** and **performance gains**.

However, if your engine is **healthy and not heavily modified**, the expense may not be worth it. **Proper installation is critical** consider having a **specialized Mercedes engine shop** perform the work to avoid mistakes.

- **If your engine is worn or you re modifying it aggressively**, invest in a **high-quality aftermarket or OEM replacement set** (e.g., Mahle, Wagner, or official Mercedes parts).

- **If your engine is running fine**, focus on **maintenance (oil changes, timing belt, fuel system)** before considering rods and pistons.

- **Get a professional diagnosis** before purchasing some issues (e.g., rod knock) may require **full engine rebuilds** rather than just rod/piston replacements.

- **Budget for labor** this is not a DIY job unless you have extensive mechanical experience.

**Final Verdict:** Only proceed with this upgrade if you have a **clear mechanical need** or **performance goals** that justify the cost. Otherwise, prioritize simpler, more cost-effective solutions.

Details:

15-20 Mercedes W213 E300 SLC300 GLC300: Engine Connecting Rod Piston Set: OEM 84k: Original parts. Item may show light scuffs, scratches or other imperfections as a result of this being used part. All of the parts are tested either before or after removal from vehicle. Large items include: hood, door shell, fender, engine, transmission, trunk hatch, windshield, bumper, reinforcement clip, sub frame, roof, quarter apron, gas tank, etc.

Please, do not purchase parts just to check and diagnose your vehicles problem. Came off of E300 with 84k miles. Items are in good working condition. Shipping cost or carrier may change, based on final destination.

part #: 2740300900 prices

• $76.50-$185.99

specifications pistonrinro:

• for models: E300, Slc300, C300
• for makes: Mercedes
• for years: 2015-2020
• mpn: 2740300900
• part type: Engine Rod Piston
• oe/oem part number: A2740300900, A2740300417, A2740303400, A2740300400, A2700300120
• country of origin: Germany
• upc: 151617181920

payments pistonrinro:

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

offer pistonrinro:

• started: April 14, 2026
• sold: 0
• availability: In Stock
• quantity: 1
• options: Ship-to-home
• best offers: True

general pistonrinro:

• condition: Used
• Car Truck Parts Accessories > Engines Engine Parts > Connecting Rods Parts

returns pistonrinro:

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

shipping pistonrinro:

• cost: $0.00
• class: Standard
• service: FedEx Ground / FedEx Home Delivery
• type: Fixed
• carrier: FedEx
• transit: 2-6 Days

seller pistonrinro:

• city: Kaufman, Texas
• rating: 99.8%
• # reviews: 56216

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