Mercedes W639 OM651 Oil Filler Neck Cylinder Head Pipe Cover Cap A6510100069

The Mercedes W639 OM651 Oil Filler Cap A6510100069 is an original part from the Oil Drain and Filler Plugs and Dipsticks group, designed for OM651 engines used in the Mercedes W639. This used, factory-original cap ensures proper sealing of the oil filler, stable lubrication system operation, and safe engine performance in daily use.

Specifications and technical data

• SKU: A6510100069-1
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6510100069
• Substitutable numbers: A6510100069, A 651 010 00 69
• Category: Oil Drain Plugs, Filler Caps & Dipsticks

Purpose and Technical Function

The oil filler cap in the OM651 engine plays a crucial role in maintaining the seal of the lubrication system and protecting the oil from external contaminants. A properly fitted component minimizes the risk of leaks, oil evaporation, and the ingress of dust or moisture into the engine, contributing to stable engine operation.

This original cap, dedicated to the Mercedes W639, guarantees a precise fit to the valve cover, correct seal pressure, and compatibility with the original filler neck geometry. This ensures a hassle-free installation and maintains the parameters specified by the vehicle manufacturer.

Construction and Fitment for Mercedes W639 OM651

This part has been specifically designed for the OM651 engine used in the W639 model, meaning its geometry, mounting method, and sealing functionality comply with Mercedes' factory requirements. The cap works with the original engine cover and does not require modifications or additional adapters.

Key functional features include:

• Factory fit for the oil filler neck in the OM651 engine,
• Secure closure of the filler neck, reducing the risk of leaks during engine operation,
• Maintenance of parameters specified by the vehicle manufacturer.

Benefits of Using an Original Oil Filler Cap

Using an original oil filler cap for the Mercedes W639 with an OM651 engine helps maintain the integrity of the lubrication system with other engine components. In practice, this means:

• Reliable lubrication system sealing due to correct pressure and fit of the seal,
• Reduced risk of oil contamination by solid particles and moisture,
• No need for modifications to the valve cover or filler neck,
• Compliance with Mercedes' service documentation and operating procedures.

A used, original part is an excellent choice for users who wish to maintain the engine's factory configuration while optimizing service costs without resorting to random aftermarket alternatives.

Condition, Origin, and Service Application

The cap is a used part obtained from disassembly, offered for economical repair or to replace a missing oil filler component. This type of component is particularly useful for:

• Replacing a damaged or lost cap,
• Restoring the completeness of the engine after bodywork or mechanical repairs,
• Servicing OM651 engines in Mercedes W639 commercial vehicles, where durability and consistent parameters are essential.

By retaining its original design, the cap is compatible with factory dipsticks and lubrication system components, facilitating service and oil level diagnostics.

Related Parts and Technical Knowledge

When working on the lubrication system and engine operating temperature, it is also important to consider the condition of the cooling system, as engine overheating affects the oil's condition and all associated components. To better understand the relationship between cooling and engine durability, please read the article Engine Cooling System – Overheating, Repair, and Used Radiators.

If you are considering a broader range of service work on your Mercedes' lubrication system and need other parts from the Oil Drain and Filler Plugs and Dipsticks group for this brand, check the available parts in the Mercedes Oil Drain and Filler Plugs and Dipsticks category.