Audi A5 8T A3 8P A6 C6 A4 B8 Diesel Engine Oil Filter Housing Cooler 045115389H

Audi A5 8T A3 8P A6 C6 A4 B8 Diesel Engine Oil Filter Housing Cooler is an original lubrication system component designed for Diesel engines in selected Audi models. Using this factory solution from the Oil coolers and lines group helps maintain stable oil temperature and proper circulation of the lubricating medium within the power unit.

Specifications and technical data

• SKU: 045115389H-1
• Mark: Audi
• Condition: Used
• OEM Part Number: 045115389H
• Substitutable numbers: 045115389H, 045 115 389 H
• Fuel type: Diesel
• Part type: Oil Cooler
• Category: Engine Oil Coolers & Lines

Purpose and function in the lubrication system

The presented oil cooler with housing and filter mount is designed as an integral part of the Audi diesel engine lubrication system. It is responsible for:

• stabilizing the operating oil temperature in the Diesel engine,
• safely routing oil flow between the engine block and the filter,
• rigidly securing the filter cartridge within the housing,
• proper sealing of oil channels.

As a result, the power unit operates under predictable thermal conditions, and the oil maintains its proper lubricating properties across the entire load range.

Benefits of using an original Audi oil cooler

Using an original Audi component for oil cooling provides a number of practical operational benefits:

• Factory fit for Diesel engines – connection geometry and mounting points are consistent with the vehicle manufacturer's specifications.
• Consistency with the cooling and lubrication system – the component works seamlessly with the stock oil pump, filter, and oil lines.
• Reduced risk of oil overheating – proper heat dissipation from the lubrication circuit promotes stable power unit operation.
• Maintaining engine performance parameters – proper oil temperature affects engine refinement, fuel consumption, and component durability.

Choosing an original oil cooler with filter housing is particularly important in diesel engines, where thermal and pressure loads are significantly higher than in gasoline units.

Installation and operational characteristics

The component has been prepared as a part intended for installation in specific Audi models, which facilitates servicing and reduces the time required for replacement. In practice, this means:

• maintaining the original geometry of connections to the engine block and oil lines,
• the ability to use standard mounting points,
• compatibility with the factory oil filter type specified for the given power unit.

Before installation, it is recommended to verify compatibility using the OEM number or the vehicle's VIN to ensure full compatibility with the specific Diesel engine version.

The importance of a functional oil cooler in a Diesel engine

In diesel engines, the oil cooling system has a direct impact on the lifespan of the power unit. Improper operation of the cooler or filter housing can lead to:

• elevated oil temperature and accelerated aging of the lubricant,
• decreased lubrication efficiency for moving parts,
• increased wear on bearings, the turbocharger, and other components interacting with the oil system.

To better understand the impact of the cooling system on power unit durability, it is worth reading an article describing typical symptoms of overheating and the role of oil coolers in various models, available here: Engine cooling system – overheating, repair, and used oil coolers.

System expansion within the same parts group

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 coolers, oil lines, or mounting hardware, check the available parts in the Audi oil coolers and lines category.