Mercedes W166 Window Rail Door Guide Seal Gasket Rear Left N/S A1667350125

Mercedes W166 Rear Left Door Seal is an original part from the Door Seals category, designed for installation in the rear, left side of the body. The precisely shaped profile ensures a tight fit to the car body, improving acoustic comfort and protecting the interior from moisture and dirt. This is a practical solution for users who want to restore the factory sealing parameters in their Mercedes.

Specifications and technical data

• SKU: A1667350125
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1667350125
• Substitutable numbers: A1667350125, A 166 735 01 25
• Location on the vehicle: Rear, Left
• Category: Door Seals

Vehicle Application and Placement

The presented seal is designed for installation in the area of the rear left door. The appropriately selected shape and material flexibility allow for proper fitting to the door frame and adjacent body elements, which limits the occurrence of leaks and unwanted noises during driving.

The placement on the vehicle is clearly defined as the rear left side, which facilitates part selection when replacing a damaged or worn seal at a specific point on the body.

Technical and Functional Characteristics

The door seal plays a crucial role in insulating the passenger cabin. It is responsible for:

• limiting the penetration of water and moisture into the vehicle's interior,
• reducing external noise and air turbulence at higher speeds,
• stable door positioning when closed,
• increasing the comfort of vehicle use in daily operation.

Thanks to its original Mercedes origin, the seal maintains the correct geometry and hardness, which promotes proper door closing and even pressure distribution around the entire perimeter.

Benefits of Using an Original Door Seal

Using an original rear left seal for the Mercedes W166 allows for the restoration of original protection and driving comfort parameters. Compared to aftermarket alternatives, a part from the same product line as the factory equipment ensures:

• dimensional consistency with the door frame and body,
• appropriate flexibility across a wide temperature range,
• stable adhesion without the need for additional modifications.

For users who want to maintain their vehicle in a condition as close as possible to its original state, choosing an original door seal is a particularly beneficial solution in terms of fit and durability.

Product Condition and Practical Application

The offered seal comes from the used parts segment, allowing for an economical replacement of a wear-and-tear item while maintaining compliance with factory specifications. This is a good solution in situations where the existing seal has suffered mechanical damage, deformation, or has lost its sealing properties.

The part is suitable for both standard repairs after a collision or bodywork intervention, as well as for gradual body renovation aimed at improving acoustic comfort and interior protection of the vehicle.

Related Products and Technical Knowledge

If you are planning a comprehensive repair or upgrade of the door area in your Mercedes and need other parts from the same group, such as additional edge seals, frame seals, or overlap seals, check the available parts in the Mercedes Door Seals category.

If you have any doubts regarding the selection of a used sealing element or used body components in general, it is worth reading the guide material Used Car Parts: Myths and Facts You Need to Know, which helps to consciously assess the advantages and limitations of such solutions.