Oil Dipstick Mercedes W164 W251 OM642 Engine Level Guide Tube Red A6420100972

Oil Dipstick Mercedes W164 W251 OM642 Engine Level Guide Tube is a precision inspection component from the Oil drain and filler plugs and dipsticks group, designed for OM642 diesel engines in Mercedes SUV and VAN vehicles. It allows for a quick, clear, and repeatable check of the oil level, which has a direct impact on the durability of the power unit and the safety of its operation.

Specifications and technical data

• SKU: A6420100972
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A6420100972
• Substitutable numbers: A6420100972, A 642 010 09 72, A642326Q02, A642326
• Color: Red
• Category: Oil Drain Plugs, Filler Caps & Dipsticks

Purpose and function of the oil dipstick

The oil dipstick in the OM642 engine is responsible for accurate control of the lubricant level in the oil pan. A correct reading is crucial for maintaining proper oil pressure and protecting the turbocharger, bearings, and other components of the crank-piston system. Using a dedicated dipstick for OM642 units in W164 and W251 bodies ensures dimensional compliance with the manufacturer's factory specifications.

The component belongs to the Oil drain and filler plugs and dipsticks assembly group, which means it works directly with the lubrication system and is designed for resistance to temperature, contact with engine oil, and repeated removal and insertion cycles.

Construction, color, and ergonomics

The dipstick is equipped with a characteristic, highly visible red handle, which makes it easy to locate quickly in the engine bay, even in limited service space. The red color serves both a practical and safety function – it minimizes the risk of confusion with other engine components.

The design of the working part of the dipstick is adapted to the guide tube in the OM642 engine, which allows for a repeatable immersion level in the oil. Thanks to this, the reading is stable, and differences between subsequent measurements result solely from changes in the oil level, not from inaccurate positioning of the component.

Benefits of using an original Mercedes component

Choosing a dipstick dedicated to the OM642 unit in W164 and W251 models allows you to maintain the factory service standards of the Mercedes manufacturer. The appropriate length, shape of the measuring tip, and range of oil level markings are matched to the specific design of the oil pan and oil channels in this engine.

Using the correct dipstick:

• facilitates oil level diagnostics during periodic inspections,
• reduces the risk of the engine running with an oil level that is too low or too high,
• supports the maintenance of proper lubrication conditions across the entire load range.

For users who consciously choose original Mercedes solutions, such a component is a consistent addition to professional vehicle service.

Condition, fitment, and practical application

The offered dipstick comes from a Mercedes vehicle and is a used component, which in practice means it has already been verified under real operating conditions. This type of component, while maintaining correct geometry and legibility of markings, retains its functionality for a long period of use.

The dipstick is intended for installation in OM642 engines used in W164 and W251 bodies, where it serves as the primary tool for checking the oil level. Replacing a worn or damaged component with a functional dipstick allows you to restore proper service maintenance of the power unit without the need to interfere with other sub-assemblies.

Related lubrication and cooling system components

Checking the oil level with a dipstick is closely related to the condition of the entire lubrication system and indirectly to the engine cooling system. The correct amount of oil affects heat dissipation from critical components of the power unit. In the context of protecting the engine against overheating and excessive thermal load, it is worth familiarizing yourself with practical tips regarding the operation of the cooling system and oil coolers, described in the article Engine cooling system – overheating, repair, and used radiators.

Expanding service maintenance in the same group

If you are planning a comprehensive repair or upgrade of the engine area in your Mercedes and need other components from the same group, such as oil drain plugs, oil filler caps, or additional measuring dipsticks, check the available parts in the Mercedes oil drain and filler plugs and dipsticks category.

For users interested in making an informed choice of original components, it is also worth reading the material explaining the importance of OEM parts and the benefits of using them in daily vehicle operation, described in the article Quality assurance and OEM safety – why are used original car parts the best choice for your car?.