Audi Volkswagen Seat Skoda Diesel Oil Filter Housing Oil Cooler 03L117021C

Audi Volkswagen Seat Skoda Diesel Oil Filter Housing Oil Cooler is a precision component of the lubrication and oil cooling system, designed for diesel engines. Thanks to the integrated design of the cooler and the filter housing, it ensures stable oil temperature, which translates into safe operation of the power unit and reduces the risk of overheating. The used original component is a sensible choice for drivers looking for a proven solution at an attractive price.

Specifications and technical data

• SKU: 03L117021C
• Mark: Audi
• Condition: Used
• OEM Part Number: 03L117021C
• Substitutable numbers: 03L117021C, 03L 117 021 C
• Fuel type: Diesel
• Category: Engine Oil Coolers & Lines

Function and application in a diesel engine

The presented oil cooler with filter housing operates in the diesel engine lubrication circuit, responsible for heat exchange between the oil and the coolant. Maintaining the correct oil temperature is crucial for:

• maintaining proper viscosity and oil film on friction components,
• reducing wear on bearings, the crankshaft, and the timing system,
• stable operation of the turbocharger, especially under load,
• reducing the risk of oil overheating in city and highway driving conditions.

By combining the cooler with the oil filter housing in one body, a compact and leak-proof assembly is achieved, which facilitates maintenance and limits the number of potential leak points.

Design and benefits of use

The element belongs to the Oil coolers and lines group, which means it has been designed to work in demanding thermal and pressure conditions. Properly shaped oil and coolant flow channels ensure:

• even oil cooling across the entire cross-section of the exchanger,
• stable pressure in the lubrication circuit,
• effective heat dissipation even during prolonged driving under load.

The oil filter housing also serves as a precision seat for the filter cartridge, which is important for system tightness and the correct direction of oil flow through the filtering medium.

Selection, installation, and operational aspects

When selecting this oil cooler with filter housing for a specific Audi, Volkswagen, Seat, or Skoda vehicle with a diesel engine, it is crucial to compare technical parameters with the vehicle's factory data. In practice, this means verifying the compatibility of the mounting, hose connections, and the configuration of the oil and coolant circuits.

During installation, it is worth paying attention to:

• using new seals and appropriate tightening torques,
• proper bleeding of the cooling system after starting the engine,
• checking for leaks after the first operating cycles on a warmed-up engine.

A system prepared in this way allows for maintaining stable oil operating conditions, which supports the durability of the power unit and reduces the risk of costly failures associated with overheating or insufficient lubrication.

Condition, origin, and advantages of choosing a used part

The offered element comes from the Audi brand, which for many users is a guarantee of maintaining factory operating parameters and fitment to the engine design. A used component of this type is a practical solution in situations where the existing oil cooler has developed a leak, mechanical damage, or internal contamination.

Choosing a used part allows you to:

• reduce repair costs while maintaining the original specification,
• limit waste by reusing functional components,
• maintain the structural integrity of the lubrication and cooling system.

If you want to better understand how an oil cooler affects the thermal safety of the power unit and what symptoms may indicate problems with the cooling system, check out the article Engine cooling system – overheating, repair, and used coolers, which discusses the topic of overheating and the role of heat exchangers in more detail.

Expanding the oil cooling system in Audi vehicles

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 oil exchangers, oil lines, or cooling connections, check the available parts in the Audi oil coolers and lines category.

In the context of repair economics and environmental impact, it is also worth considering the wider use of components from the secondary market – you can find more on this topic in the material Eco-driving: discover the benefits of used car parts, which describes the advantages of automotive recycling and a conscious approach to vehicle service.