Audi A7 S7 4G 4.0 TFSI Petrol Engine Oil Separator Breather Crankcase 079103542E

Audi A7 S7 4G 4.0 TFSI Petrol Engine Oil Separator Breather Crankcase is a specialized crankcase ventilation system component designed for petrol engines, responsible for the controlled discharge of crankcase gases and the separation of oil mist. Thanks to its precise OEM design, it ensures stable operating conditions for the power unit, supporting smooth engine performance and reducing unwanted contaminants in the intake system. This is a practical solution for users who want to maintain the efficiency of the lubrication and ventilation system in their Audi at the proper level.

Specifications and technical data

• SKU: 079103542B
• Mark: Audi
• Condition: Used
• OEM Part Number: 079103542B
• Substitutable numbers: 079103542B, 079 103 542 B, 079103542E, 079 103 542 E
• Fuel type: Petrol
• Category: Oil Sumps

Function and role of the oil separator in the 4.0 TFSI engine

The oil separator with crankcase breather in the 4.0 TFSI engine is responsible for controlling blow-by gas flow and separating oil particles from the gas mixture. A properly functioning component:

• stabilizes pressure in the crankcase,
• limits oil from entering the intake system,
• supports smooth operation of the petrol unit under various loads,
• reduces the risk of excessive oil consumption and deposits in the manifold.

For turbocharged engines, such as the 4.0 TFSI, an efficient ventilation system is crucial for maintaining proper operating parameters, which is why replacing a worn separator with an original component is a sensible service solution.

Construction and fitment for Audi A7 / S7 4G

The offered oil separator has been designed specifically for the 4.0 TFSI unit installed in the Audi A7 and S7 4G generation. The OEM construction ensures:

• geometry matched to the factory ventilation system,
• adaptation for use with petrol fuel,
• compatibility with factory engine accessories and vacuum lines,
• possibility of installation in place of the worn component without modifications.

As a result, the separator can be integrated into the existing system without the need for installation modifications, which facilitates service work and reduces vehicle downtime.

Condition, origin, and benefits of choosing OEM parts

The item comes from the original Audi parts group and is offered as a used part, which allows you to combine factory fitment with a more favorable purchase cost compared to a new component. Choosing an original oil separator means:

• maintaining the factory concept of the ventilation system in the 4.0 TFSI engine,
• consistency with other power unit accessory components,
• reduced risk of installation issues compared to aftermarket replacements.

For users planning to service the crankcase ventilation system, this is a practical option that allows for restoring proper system operation while maintaining the parameters specified by the manufacturer.

Purpose and application in the lubrication system

The oil separator with breather works with elements from the Oil pans group and other lubrication system components, influencing the circulation of oil and gases in the engine. Its proper operation is important for, among other things:

• maintaining proper pressure in the crankcase,
• limiting leaks resulting from overpressure,
• reducing the amount of oil reaching the intake and combustion chamber.

Replacing a worn or leaking component is recommended when symptoms such as increased oil consumption, unstable idle speed, or excessive oiling of intake hoses occur.

Selection by OEM number and purchase support

Due to the specifics of the 4.0 TFSI unit and differences between equipment versions, it is worth using the OEM number and vehicle data when selecting an oil separator. A practical guide on identifying parts by numbers and car data may be helpful – you can find it in the article Guide: how to choose the right car part by VIN and OEM number, where the compatibility verification process is described step by step.

If you are planning a comprehensive repair or upgrade of the lubrication and ventilation system area in your Audi and need other elements from the same group, such as housings, covers, or seals, check the available parts in the Audi Oil pans category.