Audi A6 C6 Rear Right O/S Seal Gasket Window Frame Gasket Guide Rail 4F9839440M

Audi A6 C6 Rear Right O/S Seal Gasket Window Frame Gasket Guide Rail is an original body component designed for precise sealing of the rear passenger side window guide. Thanks to its factory-fit design for the door structure, it ensures stable window operation, limits water ingress and noise, and supports the proper functioning of the window lifting mechanism. As a component from the Window seals and moldings group, it allows for the restoration of proper sealing and acoustic comfort in the rear part of the cabin.

Specifications and technical data

• SKU: 4F9839440M
• Mark: Audi
• Condition: Used
• OEM Part Number: 4F9839440M
• Substitutable numbers: 4F9839440M, 4F9 839 440 M
• Location on the vehicle: Rear, Right
• Category: Window Seals, Gaskets & Trims

Purpose and function in the Audi A6 C6

The presented seal is designed for installation in the rear right part of the body, within the door window frame. It is responsible for:

• sealing the contact point between the glass and the door frame,
• guiding the window in the correct operating track,
• reducing air drafts and wind noise at higher speeds,
• protecting the interior of the door against excessive moisture ingress.

A properly selected window frame seal is crucial for maintaining driving comfort, the correct operation of the window regulator, and protecting the internal door components from corrosion.

Construction and body fitment

The rear right window frame seal has been developed specifically for the Audi A6 C6 door structure, which translates into:

• precise shape matching to the window frame profile,
• properly formed guides that work with the glass and the guide rail,
• retention of factory mounting points within the door.

As a result, installation is straightforward, without the need for modifications or "forcing" the part into place. Proper fitment reduces the risk of rattles, play, and leaks during operation.

Benefits of using an original seal

Using an original window frame seal in the Audi A6 C6 allows for the restoration of factory window performance and vehicle comfort. The most important advantages include:

• stable window operation in the guide, without jamming or excessive play,
• reduced cabin noise originating from the rear right window area,
• better protection of door upholstery and electrical wiring against moisture,
• aesthetic finish of the window frame edge, consistent with the rest of the body.

This component is particularly recommended when replacing the glass, repairing the lifting mechanism, or after collisions where the window frame and adjacent seals have been damaged.

Component condition and service application

The offered seal comes from dismantling and is intended for re-installation in an Audi. Such original used components are frequently chosen by workshops specializing in the brand, as they allow for maintaining factory fitment while reducing repair costs. In the case of body parts such as window frame seals, proper fitment has a direct impact on the durability of the repair and user comfort.

Complementary Audi window seals and moldings

If you are planning a comprehensive repair or upgrade of the door area in your Audi and need other elements from the same group, such as additional window frame seals, trim strips, or window guides, check out the available parts in the Audi window seals and moldings category.

Technical support and knowledge about used parts

When selecting body components from the secondary market, it is worth relying on reliable information regarding the quality and cost-effectiveness of such solutions. If you want to better understand the selection process for used components, the real savings, and what to look for when verifying technical condition, check out our guide Why it is worth buying used gearboxes and engines – facts instead of myths, which discusses practical principles for selecting parts based on manufacturer markings and technical parameters.