Audi S6 C7 S7 4G Oil Filler Cap 4.0 TFSI Cylinder Head Filler Cap 079103499AE

Audi S6 C7 S7 4G Oil Filler Cap 4.0 TFSI Cylinder Head Filler Cap is an original component from the Tappet and Valve Covers group, designed for Audi engines. It ensures a tight seal for the oil filler opening in the cylinder head, stabilizing the lubrication system and protecting the engine interior from contaminants.

Specifications and technical data

• SKU: 079103499AE-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 079103499AE
• Substitutable numbers: 079103499AE, 079 103 499 AE
• Fuel type: Diesel
• Category: Rocker & Valve Covers

Purpose and technical function

The presented cap is a factory component used in the Audi 4.0 TFSI engine family. As a part of the cylinder head area, it is responsible for maintaining proper sealing at the oil refill point, which is crucial for stable pressure in the lubrication system and for limiting the evaporation and leakage of lubricant. Thanks to its precisely selected geometry and material adapted for high-temperature operation, the cap fits the cylinder head housing without any play, which translates into secure seating and repeatable tightening during oil service intervals.

Benefits of using an original Audi cap

Using an original oil filler cap in an Audi engine allows you to maintain the structural integrity of the powertrain. Compared to aftermarket replacements, a component from the same production line as other engine parts ensures:

• precise fitment to the cylinder head housing,
• appropriate resistance to temperature and contact with engine oil,
• stable sealing during repeated opening and closing,
• preservation of the factory operating parameters of the lubrication system. For users who regularly service their engine, it is important that the original cap minimizes the risk of leaks, thereby reducing the possibility of oil soiling the engine bay and preventing contaminants from entering the cylinder head.

Characteristics of the used component

The offered cap is a used part, which means it has already completed a service cycle in a vehicle. Such a part, provided it maintains proper geometry and a functional sealing surface, can be an effective alternative to new components, especially for budget-friendly repairs or restoring a car to proper technical condition without excessive costs. Choosing a used oil filler cap is a solution often used in workshops specializing in the Audi brand, especially when the priority is to maintain the manufacturer's original specifications while optimizing engine maintenance costs.

Application in the cylinder head system and compatibility

The cap works with the cylinder head in the area where the service opening for oil refilling is located. As a component from the Tappet and Valve Covers group, it is part of the zone responsible for protecting the timing mechanisms and the upper part of the engine from external factors. A correctly selected cap limits oil vapor blow-by and stabilizes operating conditions in the cylinder head chamber. In workshop practice, it is important to maintain compliance with the solutions used by the vehicle manufacturer when replacing the cap. This ensures that installation proceeds without the need for modifications and that the component works with the existing cylinder head cover and seals in a predictable and repeatable manner.

Installation and maintenance recommendations

When installing the oil filler cap, it is recommended to:

• inspect the condition of the cylinder head housing for dirt and mechanical damage,
• check the sealing surface of the cap before installation,
• tighten carefully according to the perceptible resistance of the seal, without excessive force,
• periodically check for leaks during oil changes. This approach helps maintain stable lubrication system sealing and reduces the risk of leaks in the long term, which is important for both engine durability and engine bay aesthetics. If you are planning a comprehensive repair or upgrade of the engine area in your Audi and need other elements from the same group, such as additional covers, seals, or fasteners, check out the available parts in the Audi Tappet and Valve Covers category. For a broader perspective on selecting used components for your car, including the impact of their condition on vehicle handling and characteristics, it is worth reading our guide article Stock vs. Sport Suspension – design differences and is it worth buying used suspension parts?, which helps in making informed service decisions.