Genuine OEM 2740300900 - Engine Piston

Product Overview

The Genuine OEM 2740300900 engine piston is a factory-original component designed for Mercedes-Benz 2.0L turbocharged four-cylinder gasoline engines. This piston fits the W205 C-Class sedan and coupe, W213 E-Class sedan, X253 GLC-Class SUV, R172 SLC-Class roadster, and W907 Sprinter van platforms from 2015 to 2022. Engine pistons are critical internal components that convert combustion pressure into mechanical motion; they must be replaced when damaged, scored, or worn beyond serviceable limits. Genuine OEM pistons ensure exact factory specifications, proper fitment, and durability that matches your vehicle's original engineering.

This engine piston is sold individually. A complete engine rebuild typically requires a full set of pistons, rings, and related gaskets.

Cross Reference Numbers

This Genuine OEM 2740300900 is equivalent to or replaces the following part numbers: 27403009-00, 274-030-09-00.

Vehicle Compatibility

This piston fits the popular models below. For Fitment Confidence, please use the vehicle selector tool above to verify exact compatibility for your vehicle.

• Mercedes-Benz C300 2.0L I4 Turbo (W205): 2015–2018
• Mercedes-Benz E300 2.0L I4 Turbo (W213): 2017–2019
• Mercedes-Benz GLC300 2.0L I4 Turbo (X253): 2016–2019
• Mercedes-Benz SLC300 2.0L I4 Turbo (R172): 2017–2020
• Mercedes-Benz Sprinter 1500 and 2500 2.0L I4 Turbo (W907): 2021–2022

This piston may also fit other applications. Please use the vehicle selector tool to verify fitment.

Often Replaced Together

For a complete engine rebuild or major repair, many owners replace the following at the same time:

• Piston rings and ring sets
• Connecting rod bearings
• Engine gasket sets and seals
• Valve cover gasket
• Oil pan gasket

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Frequently Asked Questions

What are the symptoms of a worn or damaged engine piston?

Common signs include excessive oil consumption, blue smoke from the exhaust, rough idle, loss of compression, knocking or pinging sounds under load, and reduced fuel economy. A compression test or borescope inspection can confirm piston damage. If you suspect piston wear, have the engine professionally diagnosed before attempting repair.

How many pistons do I need for a complete engine rebuild?

A complete engine rebuild requires one piston for each cylinder. The 2.0L four-cylinder engines in these Mercedes-Benz models have four cylinders, so you will need four pistons total. It is essential to replace all pistons as a matched set to maintain engine balance and performance.

Do I need to replace piston rings at the same time?

Yes. Whenever pistons are removed for service, piston rings should be replaced as well. Rings wear in conjunction with the piston and cylinder bore; reusing old rings with new pistons will compromise compression and oil control. A complete ring set ensures proper sealing and longevity of the repair.

What is the difference between Genuine OEM and aftermarket pistons?

Genuine OEM pistons are manufactured to Mercedes-Benz factory specifications and tolerances. They guarantee exact fitment, proper clearances, and compatibility with your engine's original design. Aftermarket pistons may vary in material composition, heat treatment, and dimensional accuracy, which can affect reliability. For critical engine internals, Genuine OEM parts provide the highest confidence in durability and performance.

What tools and expertise are required to replace engine pistons?

Piston replacement is an advanced engine repair that requires engine removal and complete disassembly. You will need specialized tools including a torque wrench, compression tools, honing equipment, and precision measurement instruments. This work should be performed by a qualified Mercedes-Benz technician or experienced engine builder. Professional labor is strongly recommended to ensure proper installation, torque specifications, and engine timing.

How long do engine pistons typically last?

Factory pistons in well-maintained engines often last 100,000 to 200,000 miles or more. Longevity depends on engine load, driving habits, oil quality, maintenance intervals, and cooling system health. Premature piston wear can result from overheating, detonation, poor fuel quality, or inadequate lubrication. Follow the manufacturer's recommended service schedule to maximize piston life.

Frequently Asked Questions

Can I replace just one damaged piston, or must I replace all four?

While it is technically possible to replace only one piston, best practice is to replace all pistons as a matched set. Factory pistons are precision-engineered for balance and consistency across all cylinders. Mixing old and new pistons can create imbalances that lead to vibration and accelerated wear. For the most reliable repair, replace the complete set.

Order Genuine OEM 2740300900 today. In-stock orders ship same or next business day from our U.S. warehouse, and our fitment team is one call away if you need help confirming the right piston for your Mercedes-Benz.

Note: All information on this page and in the FAQ is for general reference only. Verify fitment and consult a professional as needed. eEuroparts.com is not responsible for incorrect part selection or installation.