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  3. MERCEDES 30S35/4

MERCEDES 30S35-4 Bosch Diesel Fuel Injector Set Td 30S35/4 OM617 115BAR

fits model: W126, 300d. make: Mercedes.

Om617 Mercedes 30s35/4 Bosch W126 Diesel Matching Fuel Injector Set 5 115bar 300d Td

( Manufacturer Part Number: 30S35/4 ), ( Type: Fuel Injector ), ( Oe/oem Part Number: Matching Set Of 5 Injectors ), ( Country Of Origin: Germany ), ( Fuel Type: Diesel )

Review MERCEDES 30s35/4 Bosch Diesel Matching Fuel Injector Set 115bar Td fits W126 300D

The **Mercedes-Benz W126 300D (M115.960) / 300SD (M115.961) OM617 Diesel Fuel Injector Set (115 bar, Bosch LE-Jetronic)** represents a critical performance upgrade for enthusiasts and restorers seeking to revive the legendary power and reliability of these iconic 1980s and early 1990s diesel engines. Originally designed to deliver a robust 115 bar (1,667 psi) injection pressure, these Bosch LE-Jetronic injectors were engineered to work in harmony with the OM617 s mechanical fuel pump and distributor, ensuring precise fuel delivery for the 2.5-liter inline-five cylinder engine s characteristic smoothness and torque. The injectors in this set are meticulously selected from high-quality, often rebuilt or reconditioned units, ensuring they meet or exceed OEM specifications while maintaining the original Bosch precision that made these engines renowned for their durability. Each injector is designed with a **piston-type nozzle** (commonly the **BOSCH 0 221 550 001** or **0 221 550 002** variant) to deliver a fine atomization of diesel fuel, optimizing combustion efficiency and reducing soot buildup a critical factor in preserving the longevity of the OM617 s cast-iron cylinder head and turbocharged system. Whether restoring a classic 300D for track use, daily driving, or static display, this injector set provides the foundation for a reliable and performance-oriented diesel system, complementing upgrades like a high-flow fuel pump, upgraded turbocharger, or modified ECU for those pushing the limits of this timeless powerplant. For collectors and mechanics alike, these injectors are a testament to Mercedes-Benz s engineering prowess of the era, offering a blend of nostalgia and modern reusability that keeps the spirit of the W126 alive.

### **Pros and Cons of Buying a Mercedes-Benz W126 OM617 Diesel Fuel Injector Set (115bar, 300D/350D, Bosch)**

#### **Pros**

1. **Performance Improvement**

The OM617 engine in the W126 (1984 1991) is a robust but aging design, and upgrading to modern fuel injectors (115bar) can restore power, reduce lag, and improve throttle response. The Bosch injectors are known for better atomization, leading to cleaner combustion and potentially higher horsepower gains (especially if paired with a tune).

2. **Reliability and Durability**

The W126 is a well-built platform, and while the original injectors degrade over time, replacing them with high-quality aftermarket units (such as Bosch or Delphi) can prevent fuel starvation, misfires, and long-term engine damage. Properly maintained, these injectors last significantly longer than OEM parts.

3. **Compatibility with Modifications**

If you plan to further modify the engine (e.g., turbo upgrades, intercoolers, or tuning), modern injectors are a necessary step. The 115bar pressure ensures better fuel delivery under increased boost or load, reducing the risk of injector failure.

4. **Better Fuel Efficiency (If Tuned Properly)**

While stock injectors may cause rich mixtures and poor efficiency, upgraded injectors paired with a tune can optimize fuel delivery, potentially improving mileage in some cases though gains are often modest compared to power increases.

5. **Prevents Catastrophic Engine Damage**

Failing injectors can lead to carbon buildup, poor combustion, and eventual engine failure. Replacing them proactively avoids costly repairs down the line.

6. **Aftermarket Support and Availability**

The W126 community is active, and parts like Bosch injectors are widely available from specialty suppliers. There are also diagnostic tools and tuning solutions (e.g., Motec, Haltech) to optimize performance after installation.

7. **Potential for Classic Car Restoration**

If you re restoring a W126 to showroom condition, modern injectors help maintain authenticity while ensuring reliability especially if you plan to drive it regularly rather than just display it.

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#### **Cons**

1. **Cost**

A full set of Bosch 115bar injectors (for 300D/350D) typically ranges from **$800 $1,500**, depending on brand and supplier. Installation (labor) can add another **$300 $600**, depending on whether you do it yourself or take it to a shop. This is a significant investment for a classic car, especially if you re on a budget.

2. **Installation Complexity**

Replacing injectors on the OM617 requires removing the fuel rail, disconnecting wiring, and ensuring proper sealing. If not done carefully, leaks or improper connections can occur. Some owners may need to learn new skills or hire a mechanic with experience in diesel W126s.

3. **Tuning Required for Optimal Results**

Simply swapping injectors won t guarantee power gains you ll need a **standalone ECU or tune** (e.g., for a Motec or Haltech system) to adjust fuel maps, timing, and boost levels. Tuning adds another **$300 $1,000 **, depending on the complexity.

4. **Potential for Compatibility Issues**

While Bosch injectors are a common upgrade, some owners report slight variations in flow rates or pressure between brands. Ensuring the correct part numbers (e.g., **Bosch 0 221 150 004** for 300D/350D) is crucial to avoid mismatches.

5. **Ongoing Maintenance Considerations**

Upgraded injectors may require more frequent cleaning or servicing than stock units, especially if you drive aggressively or modify the engine further. Carbon buildup and injector fouling can still occur if the engine isn t maintained properly.

6. **Depreciation and Classic Car Value**

While performance upgrades can enhance enjoyment, they may not increase the car s resale value. Some classic car purists prefer keeping original components intact, which could limit future sales appeal.

7. **Risk of Overkill for Mild Use**

If you only drive the car occasionally or for leisurely cruising, the performance gains from upgraded injectors may not justify the cost. Stock injectors can last indefinitely with proper maintenance (fuel additives, regular servicing).

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### **Recommendation**

#### **Who Should Buy These Injectors?**

- **Performance-focused W126 owners** who want to restore or enhance their engine s power and reliability.

- **Those planning further modifications** (turbo, intercooler, tuning) and need modern injectors to support increased fuel delivery.

- **Owners experiencing injector failure symptoms** (rough idling, poor acceleration, check engine lights) and want a long-term solution.

- **Restorers aiming for a balance** between authenticity and drivability, especially if the car will be driven regularly.

#### **Who Should Avoid or Delay This Purchase?**

- **Budget-conscious buyers** who prioritize cost over performance and can maintain stock injectors with fuel additives.

- **Occasional drivers** who mostly use the car for static displays or rare outings.

- **Those unwilling to invest in tuning** injector upgrades alone won t maximize gains.

- **Owners who prefer minimal modifications** and want to preserve the car s originality for resale.

#### **Final Recommendation**

If you re committed to **restoring or modifying your W126 OM617**, upgrading to **Bosch 115bar injectors** is a worthwhile investment. They provide a significant performance boost, improve reliability, and are necessary for further tuning. However, **budget for tuning** (at least a basic fuel map adjustment) to unlock the full potential.

If you re unsure, **test the injectors first** some suppliers offer rental or loaner sets to verify improvements before committing. Additionally, **consult with experienced W126 tuners** to ensure compatibility with your specific engine condition.

For most serious W126 enthusiasts, this upgrade is a **smart long-term choice**, but weigh the costs against your driving goals and budget.

Details:

Manufacturers have many color options when these vehicles were manufactured. In the end, this is a used part and you can expect there to be some regular wear tear. Threads are good. Functions as it should.

As with any manufacturer, these parts can cross reference to other model's, model years, and so on. Things like surface scratches, chips, dents, tears, stains, or a bit of debris. Please remember that these are USED ITEMS and it means SOME OR MOST of the useful life may have been depleted but still works. We ask that you check and re-check color codes to verify the part being ordered is correct for your vehicle.

Mercedes Benz Injectors - 5 OM617,: Decent Shape. We attempt to describe the best of out ability as well take photos show color, but on occasion, color might not be portrayed correctly. With that said, there can be variation in color from sun fading, cleaning chemicals, use and more. Tested and verified working.

Please know that we must pull the part, pack and seal it.

part #: 30s354 prices

  • $118.64-$475.00

specifications carfuelinjector:

  • for models: W126, 300d
  • for makes: Mercedes
  • mpn: 30s35/4
  • type: Fuel Injector
  • oe/oem part number: Matching Set Of 5 Injectors
  • country of origin: Germany
  • fuel type: Diesel

shipping carfuelinjector:

  • transit: 4-9 Days
  • carrier: UPS, FedEx
  • service: UPS Ground Saver, FedEx Ground Economy
  • class: Economy
  • cost: $4.95
  • type: Fixed

offer carfuelinjector:

  • best offers: True
  • availability: In Stock
  • quantity: 1
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  • started: March 22, 2026
  • options: Ship-to-home

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general carfuelinjector:

  • Air Fuel Delivery > Fuel Injection Parts > Fuel Injectors
  • condition: Used

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for models: w126, 300d, for makes: mercedes, type: fuel injector, oe/oem part number: matching set of 5 injectors, country of origin: germany, fuel type: diesel,
category: auto parts > air fuel delivery > fuel injection parts > fuel injectors, sku: 15433348479494633,
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