Audi A6 C8 Rear Door Seal Gasket Outer Weatherstrip Lower Left N/S 4K0839699

Audi A6 C8 Rear Door Seal Gasket Outer Weatherstrip Lower Left N/S is an original body component from the Door Seals group, designed for installation on the rear left side. It ensures a tight window guide, reduces wind noise, and protects the interior of the door from moisture and contaminants, which translates into stable operation of the window lifting mechanism and acoustic comfort in the cabin.

Specifications and technical data

• SKU: 4K0839699
• Mark: Audi
• Condition: Used
• OEM Part Number: 4K0839699
• Substitutable numbers: 4K0839699, 4K0 839 699
• Location on the vehicle: Rear, Left
• Part type: Door Seal
• Category: Door Seals

Purpose and function in the Audi A6 C8 body

The presented seal is an external lower component for the rear left door window, designed specifically for the Audi A6 C8 generation. It is responsible for:

• sealing the contact point between the window and the door panel from the outside,
• draining water from the window surface away from the door contour,
• limiting the ingress of dirt into the interior of the door,
• stabilizing the window guide during raising and lowering. Thanks to its fitment for the specific body model, proper adhesion to the window edge and door metal is maintained, which supports the factory level of tightness and driving comfort.

Advantages of the original Audi door seal

The original Audi A6 C8 rear left door window seal has been manufactured in accordance with the vehicle manufacturer's standards, which translates into predictable material behavior during operation. Compared to random replacements, it provides:

• precise fit to the shape of the door and window – no need for modifications or trimming,
• visual consistency with other body sealing elements,
• appropriate stiffness and flexibility of the profile, which is important during frequent door opening and window mechanism operation,
• maintenance of the factory contact line between the window and the panel, which is significant for aerodynamics and noise levels. An element from this group is particularly important in premium class cars, such as the Audi A6 C8, where increased acoustic comfort and aesthetic finishing of the door zone are expected.

Condition, installation, and service application

The seal comes from dismantling, which means it is an original Audi component of verified origin, intended for re-installation. Such elements are frequently used in professional service centers and workshops specializing in the Audi brand, as they allow for maintaining the factory fit and character of the door operation. The placement on the vehicle is the rear left side, so when planning a repair, it is worth paying attention to compatibility with the specific side of the body. Replacing the seal is a typical service operation performed, among others, during:

• regeneration or replacement of the window lifting mechanism,
• post-accident repairs of the rear door,
• removing leaks and excessive noise in the window area.

Why it is worth choosing original used OEM parts

In the case of elements such as door seals, original parts from dismantling often provide a better fit than cheap replacements with uncertain material specifications. Maintaining the factory profile and rubber hardness has a direct impact on tightness, the smoothness of window operation, and the durability of the entire door system. If you want to better understand why such a solution is beneficial in the long term, it is worth reading the article Why do original parts from dismantling fit better (and last longer) than cheap equivalents?.

Expanding the door zone in Audi – selecting other seals

If you are planning a comprehensive repair or modernization of the door zone in your Audi and need other elements from the same group, such as perimeter seals, sealing strips, or additional profiles near the windows, check the available parts in the Audi Door Seals category.

Summary

Audi A6 C8 Rear Door Seal Gasket Outer Weatherstrip Lower Left N/S is a practical choice for users who want to restore the factory tightness and aesthetics of the door zone without sacrificing original Audi quality. Proper fitment to the rear left side of the body, maintenance of correct window guidance, and protection of the door interior from moisture make this a functional and technically justified solution for any major repair of this body part.