Audi A7 A6 4G Gearbox Oil Cooler 3.0 Diesel 4G0317021M Automatic Transmission

Audi A7 A6 4G Gearbox Oil Cooler 3.0 Diesel is a factory-original transmission oil cooling component designed for use with automatic transmissions in diesel engines. It is responsible for stabilizing oil temperature, which results in smoother gear shifts, reduced component wear, and safer drivetrain operation. This solution is dedicated to high-end Audi models where precision and drivetrain predictability are paramount.

Specifications and technical data

• SKU: 4G0317021M
• Mark: Audi
• Condition: Used
• OEM Part Number: 4G0317021M
• Substitutable numbers: 4G0317021M, 4G0 317 021 M
• Fuel type: Diesel
• Gearbox type: Automatic
• Part type: Oil Cooler
• Category: Engine Oil Coolers & Lines

Purpose and role in the drivetrain

The presented oil cooler operates within the transmission oil circuit in diesel-powered vehicles, ensuring control over the lubricant's temperature. It is configured to work with an automatic transmission, where stable thermal conditions are crucial for the durability of clutches, control valves, and mechatronics. Maintaining the proper oil temperature reduces the risk of overheating, viscosity loss, and accelerated wear of friction elements.

Benefits of using an original oil cooler

Using an original oil cooler in the Audi A6 / A7 4G series allows for maintaining the factory operating parameters of the transmission. This component is designed for the specific thermal loads of a diesel engine and the characteristics of the automatic transmission, which ensures:

• predictable oil cooling across the full load range,
• reduced risk of overheating during highway driving and in urban conditions,
• support for stable operation of the lubrication system and transmission hydraulics,
• maintenance of drivetrain refinement consistent with the manufacturer's specifications. For the user, this means more consistent gear shifting, better transmission protection, and a lower risk of costly repairs associated with oil overheating.

Technical characteristics and system integration

The cooler belongs to the Oil coolers and lines group, working in conjunction with the drivetrain lubrication and cooling system. It is adapted for use with transmission oil used in automatic gearboxes in diesel units, which requires resistance to variable pressure, temperature, and long-term thermal loads. The design allows for integration with the existing oil line system, facilitating installation in compatible vehicles.

Condition of the component and practical application

The offered cooler is a used part, which in practice allows for an economical repair of the oil cooling system while maintaining the original manufacturer's specifications. In the event of symptoms such as transmission overheating, uneven gear operation after warming up, or messages regarding high oil temperature, replacing the cooler with a functional unit from the same design group is one of the fundamental diagnostic and repair steps.

Technical support and knowledge about the cooling system

To better understand the impact of a functional cooling system on drivetrain durability, it is worth consulting our guide describing the relationship between operating temperature and powertrain lifespan – this is discussed in detail in the article Engine cooling system – overheating, repair, and used radiators. It allows you to translate theory into service practice and approach component selection consciously. If you are planning a comprehensive repair or upgrade of the transmission lubrication and cooling area in your Audi and need other elements from the same group, such as additional coolers, oil lines, or connectors, check the available parts in the Audi oil coolers and lines category.