Audi A3 8V A4 B8 Oil Cooler Cooling Unit 1.6 TDI Diesel Engine 03N117021

The Audi A3 8V A4 B8 Oil Cooler 1.6 TDI Diesel is an original lubrication system component designed for diesel engines, manufactured by Audi. It stabilizes the operating oil temperature in 1.6 TDI units, promoting smooth engine operation and reducing the risk of overheating in both urban and highway conditions.

Specifications and technical data

• SKU: 03N117021
• Mark: Audi
• Condition: Used
• OEM Part Number: 03N117021
• Substitutable numbers: 03N117021, 03N 117 021
• Fuel type: Diesel
• Part type: Oil Cooler
• Category: Engine Oil Coolers & Lines

Purpose and Function in a Diesel Engine

This oil cooler belongs to the Oil Coolers and Hoses category and is compatible with Diesel engines, particularly the popular 1.6 TDI engine used in Audi A3 8V and A4 B8 models. Its function is to dissipate excess heat from the engine oil, which:

• stabilizes lubrication parameters under high load,
• limits oil degradation during prolonged driving,
• supports maintaining proper lubrication system pressure,
• indirectly protects engine mechanical components from accelerated wear.

Being designed for a specific diesel engine family, this cooler integrates seamlessly with the factory cooling and lubrication systems without requiring structural modifications.

Benefits of Using an Original Audi Oil Cooler

Choosing an original Audi oil cooler ensures predictable lubrication system performance and compliance with the manufacturer's original specifications. Key advantages include:

• Factory Fitment for mounting points and connection ports in the 1.6 TDI engine,
• maintaining the heat exchange efficiency designed by the manufacturer,
• compatibility with the stock oil and cooling systems in Audi A3 8V and A4 B8,
• alignment with the performance parameters of the diesel unit, even during dynamic driving.

This configured component helps maintain stable oil temperatures under typical operating conditions, which is particularly crucial for modern diesel engines with high boost pressures and advanced emission control systems.

Performance Characteristics of a Used Part

The offered oil cooler is a used part, providing a cost-effective alternative to new components while retaining the original Audi design. This type of solution is often chosen for:

• repairs after localized oil cooling system damage,
• preventative maintenance on vehicles with higher mileage,
• optimizing operating costs for fleet vehicles.

Prior to installation, a standard workshop procedure is recommended: checking for leaks, cleaning oil passages, and verifying mating surfaces to ensure proper cooperation with seals and the rest of the system.

Integration with the Cooling and Lubrication System

The oil cooler in the 1.6 TDI engine operates in close conjunction with the liquid cooling system and the engine oil circuit. A correctly selected component:

• maintains oil within optimal operating temperature ranges,
• limits oil viscosity fluctuations during sudden load changes,
• supports stable operation of the turbocharger and the diesel injection system.

When replacing the cooler, it is advisable to inspect the condition of the oil and coolant lines to prevent leaks and maintain the overall system's efficiency.

If you are planning a comprehensive repair or upgrade of the engine area in your Audi and require other parts from the same category, such as additional oil coolers, oil lines, or connection components, please check the available parts in the Audi Oil Coolers and Hoses category.

Technical Support and Service Knowledge

To better understand the impact of temperature on the cooling and lubrication system, and to plan maintenance during high-temperature periods effectively, we recommend consulting our guide: Summer Heat vs. Cooling System: Used Coolers and Fans for Savings. You will find practical tips on operating and selecting used cooling components for passenger cars.