MERCEDES 2740370300 Engine Motor Piston Connecting Rod 15-16-17-18 Benz W205

( Manufacturer Part Number: 2740370300 ), ( Type: Motor Piston W/connecting Rod ), ( Ipn: 15 16 17 18 ), ( Donore Vehicle: 2015-2020 Mercedes C300 W205 ), ( Oe/oem Part Number: 2740370300, 27 403 703 00, 27-40370300, 27-403-703-00, 27/40370300, 27/403/70300, 27/403/703/00, 27.40370300, 27.403.703.00, 274.0370300, 274.037.0300, 274.037.03.00, 274 037 03 00, 274-0370300, 274-037-03-00, Oem ), ( Vintage Part: No ), ( Country Of Origin: Germany )

Review MERCEDES benz Engine Motor Piston Connecting Rod Oem fits C300 2015–2020

The **Mercedes-Benz 2740370300 engine component set**, specifically designed for the **M274 DE 20 LE V6 3.0L Turbocharged Direct Injection (TDI) engine** found in the **W205 C-Class (2015 2020)**, represents a critical high-performance assembly that ensures optimal power delivery, reliability, and longevity for this sophisticated internal combustion system. This meticulously engineered set includes the **piston, connecting rod, and associated components** core elements that convert the explosive force of combustion into linear motion, driving the crankshaft and ultimately the vehicle s wheels. The **forged aluminum pistons** in this assembly are precision-machined to exacting tolerances, featuring **honeycomb-style crown designs** to enhance heat dissipation and reduce thermal stress, while the **high-strength steel connecting rods** are dynamically balanced to minimize vibration and wear, even under the demanding conditions of turbocharged operation. The **piston rings**, typically included in this set, are crafted from high-grade materials such as **chromium-plated or molybdenum-coated steel**, ensuring a tight seal against cylinder walls to prevent oil consumption and blow-by, thereby maintaining compression efficiency and fuel economy. This component set is engineered to meet or exceed **OEM specifications**, utilizing **laser-welded or fully machined construction** for durability, and is compatible with the **M274 engine s 90mm stroke and 84mm bore**, delivering a seamless fit for both stock and performance-oriented applications. Whether installed during a **major overhaul, engine rebuild, or as part of a preventive maintenance strategy**, this set is designed to restore or enhance the engine s performance, torque output (up to **306 hp and 309 lb-ft in the C300 TDI**), and overall drivability, while extending the engine s service life under the rigorous demands of daily driving, towing, or spirited acceleration. The **2740370300 part number** ensures compatibility with the **W205 C-Class (2015 2020)**, including the **C300 TDI, C350, and C400 models**, making it an essential upgrade for owners seeking to restore factory performance or improve upon it with aftermarket tuning. Proper installation, accompanied by the use of **high-quality engine oil (5W-40 or 0W-40 synthetic) and gaskets**, ensures that this component set operates at peak efficiency, reducing the risk of catastrophic failure and maintaining the engine s reputation for German engineering precision.

### **Pros and Cons of Buying a 2015 2020 Mercedes-Benz C300 (W205) with the M274 Engine (2.0L Turbo 4-Cylinder)**

#### **Pros**

1. **Fuel Efficiency and Cost Savings**

The M274 engine is a turbocharged inline-4, offering better fuel economy than the older V6 models (e.g., M272) that were common in pre-2014 C-Class cars. Expect around **18 22 MPG combined** (city/highway), depending on driving style and transmission choice. This reduces long-term fuel costs compared to larger engines.

2. **Lower Purchase Price Compared to V6 Models**

The C300 (M274) is significantly cheaper to buy than the C300 CDI (diesel) or the C350 (V6) models. This makes it an attractive entry point for Mercedes ownership, especially for those who prioritize practicality over raw power.

3. **Modern Turbocharged Technology**

The M274 is a refined 2.0L turbo engine with direct injection, multi-valve technology, and variable valve timing (VVT). It delivers **241 hp and 258 lb-ft of torque**, which is adequate for daily driving, though it lacks the smoothness and low-end torque of a V6 or V8.

4. **Automatic Transmission Options**

The C300 is available with either a **7G-Tronic 7-speed automatic** (standard) or a **7G-DCT dual-clutch automatic** (optional). The 7G-Tronic is smooth and reliable, though the DCT can be less engaging for enthusiasts.

5. **Comfortable and Refined Ride**

The W205 C-Class is known for its **luxurious interior**, high-quality materials, and well-insulated cabin, making it ideal for city and highway commuting. The suspension is tuned for comfort rather than sportiness.

6. **Good Safety Features (Standard on Later Models)**

- **ESP (Electronic Stability Control)**

- **Adaptive Cruise Control (DISTRONIC PLUS)**

- **Lane Keeping Assist (optional on some trims)**

- **Blind Spot Monitoring (optional)**

These features enhance safety, though they are not as advanced as those in higher-end Mercedes models.

7. **Reliability Improvements Over Older M274 Models**

- **Reduced turbo lag** compared to earlier iterations.

- **Improved oil consumption issues** (though some reports of oil leaks persist).

- **Better fuel injection systems** with fewer failure points.

8. **Affordable Maintenance Compared to V8 or V12 Models**

Parts and labor for a 2.0L turbo engine are cheaper than those for larger Mercedes engines. Routine maintenance (oil changes, spark plugs, timing belt) is less expensive than for a V6 or V8.

9. **Good Resale Value for a Compact Luxury Sedan**

While not as high as a BMW 3 Series or Audi A4, the C300 holds its value reasonably well, especially in well-maintained examples.

10. **Available as a Sedan or Estate (Wagon)**

The C300 is offered in both **sedan and station wagon (C300 Estate) body styles**, providing more cargo space if needed.

---

#### **Cons**

1. **Underpowered for Performance-Oriented Drivers**

The **241 hp M274 is not a high-performance engine**. It struggles with **highway passing, towing, or aggressive driving**, especially when fully loaded. The turbocharged nature means it can feel **slow off the line** compared to a naturally aspirated V6.

2. **Turbocharger Reliability Concerns**

- **Whining or rattling noises** from the turbo.

- **Loss of power or excessive smoke** from the exhaust.

- **Oil leaks** from the turbo housing (common issue).

Replacing a turbo can cost **$1,500 $3,000**, including labor.

3. **Oil Consumption Issues**

Some owners report **excessive oil burning**, leading to **low oil levels** between changes. This is more common in **higher-mileage examples (100K miles)**. Regular oil checks are necessary.

4. **Transmission Problems (7G-Tronic & DCT)**

- **7G-Tronic:** Some reports of **rough shifting, delayed engagement, or complete failure** (especially in older 2015 2016 models). A **transmission fluid flush** can help, but a rebuild may be needed later.

- **DCT (Dual-Clutch):** Known for **jerky shifts, clutch wear, and premature failure**. Many owners avoid it due to reliability concerns.

5. **Poor Low-End Torque**

The M274 lacks the **smooth, linear power delivery** of a V6. It can feel **twitchy at low RPMs** and requires **higher revs** to feel responsive, which is less enjoyable for daily driving.

6. **Infotainment System Limitations**

The **MBUX system (introduced in 2017 )** is good but **not as advanced as competitors** (e.g., BMW iDrive, Audi MMI). Earlier models (2015 2016) have a **clunky, outdated interface** with slow response times.

7. **Rust Issues (Especially in Snowy Regions)**

The W205 has been criticized for **poor rust protection**, particularly in the **wheel arches, sills, and underbody**. A **pre-purchase inspection** is crucial if buying from a snowy climate.

8. **Higher Maintenance Costs Than a BMW/Audi**

While parts are cheaper than a V6/V8 Mercedes, **labor costs are high**, and **specialized mechanics** may be needed for proper servicing.

9. **Noisy Cabin in Some Examples**

Some owners report **wind noise, road noise, and engine cover vibrations**, especially in **higher-revving scenarios**.

10. **Limited Aftermarket Support**

Unlike BMW or Audi, **aftermarket parts and tuning options** for the M274 are **limited**. Performance upgrades (e.g., turbo upgrades, exhaust) are **expensive and not widely available**.

11. **Recall and Software Issues**

Some 2015 2016 C300s had **recalls for transmission and fuel system issues**. Checking **Mercedes recall status** is important before purchase.

12. **Depreciation Rate**

The C300 (M274) **depreciates faster than V6 models** due to its lower power output. If you plan to sell later, a V6 (C350) may retain value better.

---

### **Ending Conclusion**

The **2015 2020 Mercedes-Benz C300 (W205, M274 engine)** is a **practical, fuel-efficient, and comfortable** choice for those who prioritize **luxury, reliability (within limits), and affordability** over raw performance. It is best suited for:

- **City and highway commuters** who want a refined, quiet, and efficient sedan.

- **Budget-conscious buyers** who don t need a high-performance engine.

- **Owners who plan to keep the car for 5 7 years** and perform **regular maintenance**.

- **Performance enthusiasts** who want a smooth, torquey engine.

- **Those who frequently tow or carry heavy loads**.

- **Buyers who dislike turbocharged engines** or are sensitive to **transmission quirks**.

- **People in snowy regions** who may face **rust and corrosion issues**.

### **Recommendation**

You need a **reliable, comfortable, and fuel-efficient** luxury sedan.

You **drive mostly in the city or on highways** and don t need excessive power.

You **plan to perform regular maintenance** (oil changes, turbo checks, transmission fluid flushes).

You **find a well-documented example** with **under 80K miles** and a **clean service history**.

You **prefer Mercedes luxury over BMW/Audi s sportier alternatives**.

You **need a high-performance or torquey engine** for towing or spirited driving.

You **cannot afford potential turbo or transmission repairs**.

You **live in a harsh climate** (snow, salt) and are concerned about rust.

You **want a car that holds value well** (a C350 V6 may be a better long-term investment).

- **If you want more power:** Consider a **

Details:

It is a USED factory original part. Good condition. Genuine OE OEM original. DONORE VEHICLE: 2015 2020 MERCEDES C300 W205.

There are traces of use.

part #: 2740370300 prices

• $64.00-$185.99

specifications pistonringro:

• for makes: Mercedes
• for years: 2015-2020
• mpn: 2740370300
• type: Motor Piston W/connecting Rod
• ipn: 15 16 17 18
• donore vehicle: 2015-2020 Mercedes C300 W205
• oe/oem part number: 2740370300, 27 403 703 00, 27-40370300, 27-403-703-00, 27/40370300, 27/403/70300, 27/403/703/00, 27.40370300, 27.403.703.00, 274.0370300, 274.037.0300, 274.037.03.00, 274 037 03 00, 274-0370300, 274-037-03-00, Oem
• vintage part: No
• country of origin: Germany

general pistonringro:

• Car Truck Parts Accessories > Engines Engine Parts > Pistons Rings
• condition: Used

payments pistonringro:

• other
• wallet: Paypal
• credit card: Visa

seller pistonringro:

• # reviews: 267
• city: Miami, Florida
• rating: 100.0%

offer pistonringro:

• options: Ship-to-home
• sold: 0
• availability: In Stock
• best offers: True
• started: April 13, 2026
• quantity: 1

returns pistonringro:

• policy: No Returns

shipping pistonringro:

• transit: 4-9 Days
• type: Fixed
• class: Standard
• service: FedEx Ground / FedEx Home Delivery
• cost: $45.00
• carrier: FedEx

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