Mercedes GL420 CDI X164 Diesel OM629 Intake Manifold Air Inlet A6290900744

Mercedes GL420 CDI X164 Diesel OM629 Intake Manifold Air Inlet is an original intake system component designed for OM629 diesel engines in the X164 GL-Class model. The precise geometry of the intake channels and factory-standard fitment to the power unit ensure stable operating parameters, uniform cylinder filling, and predictable engine behavior across the full load range. This is the ideal solution for users who want to maintain the factory performance characteristics of their engine when replacing a worn-out manifold.

Specifications and technical data

• SKU: A6290900744
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6290900744
• Substitutable numbers: A6290900744, A 629 090 07 44, A6290983207, A 629 098 32 07
• Fuel type: Diesel
• Category: Intake Manifolds

Purpose and function in the intake system

The intake manifold in a diesel engine is responsible for distributing air to individual cylinders and maintaining the correct flow velocity within the channels. In the OM629 unit, using the correct manifold is crucial for:

• stable operation at idle and under load,
• proper mixture formation in a diesel engine,
• maintaining factory torque parameters in the low and mid-RPM ranges,
• compatibility with the engine management system and intake accessories.

Selecting the right component for a specific version of the OM629 engine reduces the risk of ECU errors, uneven operation, and performance drops.

Compatibility with the OM629 Diesel engine

The presented manifold has been designed to work with a Diesel power unit, meaning the channel geometry is adapted to the boost characteristics, operating pressures, and temperatures typical for diesel engines. The manifold design accounts for:

• adequate body rigidity under high boost pressure,
• air flow optimized for the operation of a turbocharged diesel,
• compatibility with factory intake accessories in the Mercedes GL X164 class.

Such precise fitment facilitates the maintenance of correct combustion parameters, which translates into smooth operation and predictable throttle response.

Characteristics of the used product

This item comes from the secondary market, which allows for an economical replacement of a worn or damaged manifold while maintaining the manufacturer's original specifications. A used intake manifold is a good choice when:

• maintaining the factory design of the intake system is a priority,
• compatibility with existing engine accessories is important,
• a cost-effective solution for repairing an OM629 unit is sought.

Using an original part from the same model series minimizes the need for installation modifications and simplifies future maintenance.

Why choose an original Mercedes intake manifold

In the case of advanced diesel units such as the OM629, using a factory intake manifold has a direct impact on the proper operation of the entire powertrain. An original part ensures:

• consistency with engine control maps and factory design assumptions,
• correct air routing across the entire load range,
• easier diagnostics in the event of potential future faults.

For workshops and private users, this means a lower risk of operational issues after replacement and a predictable repair outcome.

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other parts from the same group, such as intake manifolds, air duct elements, or intake system components, check out the available parts in the Mercedes Intake Manifolds category.

Technical support and knowledge about intake systems

When selecting a used intake manifold for advanced diesel units, it is worth considering the condition of the intake system as a whole, including the tightness of the hoses, the condition of the accessories, and the correctness of the installation. Additional information on the operation of components in the air and exhaust flow path can be found in our blog article: Performance exhaust systems: used manifolds and sports catalytic converters on the road, which discusses the practical aspects of using used manifolds in various brands, including Mercedes.