BMW F10 M5 F12 F13 M6 S63N Intercooler Charge Air Radiator Cyl. 5-8 7843123

BMW F10 M5 F12 F13 M6 S63N Intercooler Charge Air Radiator Cyl. 5-8 is an original forced induction system component designed for the S63N engine in high-performance BMW models. This specialized charge air cooler, serving cylinders 5–8, ensures stable operating conditions for the powertrain under high loads. Thanks to its precise OEM design, it provides a solid foundation for service replacement in demanding applications.

Specifications and technical data

• SKU: 7843123-1
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7843123
• Substitutable numbers: 7843123, 17517843123
• Category: Intercoolers

Purpose and role in the forced induction system

The presented charge air cooler is a component from the Intercoolers group, responsible for reducing the temperature of the compressed air entering cylinders 5–8 of the S63N engine. Maintaining a sufficiently low intake air temperature translates into stable power, repeatable performance, and reduced risk of engine knocking during dynamic driving.

Its dedicated application in the V8 unit allows for optimal matching of flow and heat exchange surface area to the operating characteristics of the engine in the BMW F10 M5 and F12 series. As a result, the forced induction system maintains proper thermal headroom both in city traffic and during intensive track use.

Benefits of using an original intercooler

Using an original charge air cooler in the S63N engine offers a range of practical service and operational benefits:

• Factory fitment – maintaining the original geometry of connections and mounts facilitates installation and minimizes the risk of leaks.
• Stable operating parameters – a properly selected heat exchange surface supports the maintenance of repeatable power across the full load range.
• Consistency with other forced induction system components – compatibility with stock hoses, manifolds, and engine accessories.
• Safe operation at high temperatures – construction designed to withstand the high thermal loads typical of V8 biturbo units.

Product characteristics and condition

The offered charge air cooler comes from the BMW line and is an OEM component, which means it adheres to factory manufacturing standards and complies with the manufacturer's documentation. The product is in Used condition, which in practice means that a standard leak test and visual inspection for any wear-related damage typical of used components are recommended before installation.

This type of component is particularly important in vehicles undergoing modifications or intensive use, where the thermal stability of the forced induction system has a direct impact on engine durability. Replacing a worn intercooler with a functional OEM component allows for the restoration of proper engine operating conditions without interfering with the factory design.

High-temperature operation and additional technical information

High-power engines, such as the S63N, are particularly sensitive to thermal conditions, especially during the summer. A functional charge air cooler limits the rise in intake air temperature, which supports mixture stability and improves engine refinement. In the case of used components, proper bleeding and system inspection after installation are crucial to ensure full cooling efficiency.

If you want to better understand the impact of ambient temperature on the cooling system and related components, it is worth checking out our guide Summer heat vs. cooling system: used radiators and fans as a guarantee of savings, where we discuss practical aspects of high-temperature operation and the importance of properly selected components.

Expanding your BMW forced induction system service

If you are planning a comprehensive repair or upgrade of your BMW's engine bay and need other components from the same group, such as additional radiators, charge air hoses, or auxiliary air cooling system parts, check out the available parts in the BMW Intercoolers category.

Summary

BMW F10 M5 F12 F13 M6 S63N Intercooler Charge Air Radiator Cyl. 5-8 is a functional service solution for demanding users who expect to maintain the factory operating parameters of their V8 biturbo engine. Choosing an original intercooler allows for hassle-free installation, consistency with other system components, and the maintenance of stable thermal conditions, which directly impacts the durability and performance of the powertrain.