CSF BMW E39 M5 / 540i (MT) High-Performance All-Aluminum Radiator

With over five decades of dedicated expertise in radiator manufacturing, CSF stands as a leader in delivering superior cooling solutions for automotive applications. The CSF BMW E39 M5 / 540i (MT) High-Performance All-Aluminum Radiator exemplifies this legacy, engineered meticulously to maintain optimal engine temperatures and enhance vehicle reliability under demanding conditions. Whether utilized in everyday driving or high-intensity track environments, this radiator is designed to meet the rigorous demands of both high horsepower builds and motorsport vehicles, ensuring consistent cooling performance and durability.

Product Details

The radiator incorporates a 2-Row core constructed with CSF’s proprietary B-Tube Technology. Unlike conventional oval “O” shaped tubes, the innovative “B” shaped tubes are precision-formed and seam-brazed, resulting in a structure that is both lighter and stronger. This advanced design allows the use of thinner aluminum material, which significantly improves heat dissipation efficiency without compromising structural integrity. The unique inlet positioned in the center of the tube, sealed by brazing, increases the heat transfer surface area by approximately 15% compared to traditional tubes. This enhancement effectively doubles the cooling capacity within the same spatial constraints by enabling dual liquid laminar flow through the tubes.

Complementing the core design, CSF employs ultra-efficient multi-louvered fins with a 6.5mm fin height, precisely aligned to maximize airflow and heat rejection. Each fin is engineered and tested extensively in CSF’s wind tunnel laboratory to ensure optimal thermal performance tailored to the specific vehicle application. The combination of B-Tube Technology and advanced fin design results in superior cooling efficiency, essential for maintaining engine performance and longevity.

The CSF radiator for the BMW E39 M5/540i is a true “drop-in fit” component, requiring no modifications during installation. It features CNC-machined and welded OE-style brackets that provide exceptional durability and precise fitment. The inlet and outlet connections are designed to match the original equipment manufacturer (OEM) specifications, allowing seamless integration with existing OEM or aftermarket hoses. This attention to detail ensures a straightforward installation process and reliable operation in all conditions.

[?] Frequently Asked Questions

• Left Hand Side Drain Plug Thread Pitch = AN6 9/16 - 18UNF
• Right Hand Side Drain Plug Thread Pitch = A3/8 - 18 NPT

⚠ Fitment Notes

BMW 540i (E39) before 09/1998

The CSF #7064 radiator is equipped with OE BMW quick-connect radiator hose connections. However, models manufactured prior to 09/1998 utilize slip-on style hose connections. To ensure compatibility with these earlier models, several component updates are necessary. These parts are commonly replaced during routine cooling system maintenance and include:

• Water Pump: 11510393336
• Thermostat Housing: 11531436386
• Overflow Tank to Thermostat Hose: 11531711377
• Lower Radiator Hose: 11537505229
• Upper Radiator Hose*: 11537505228

*Note: The upper radiator hose includes a provision for alternator cooling found in models produced after 09/1998. For pre-09/1998 vehicles, this secondary hose is not utilized and must be capped accordingly.

BMW E39 540i Radiator & Hoses up to 09/1998 BMW E39 540i Radiator & Hoses after/post 09/1998

BMW 540i (E39) with Automatic Transmission (AT)

Although primarily designed for manual transmission models, this radiator is compatible with automatic transmission variants produced before 09/1998 without any modifications. For automatic models manufactured after 09/1998, minimal alteration to the drain plug is required.

Specifically, post-09/1998 automatic 540i models incorporate a water-to-oil transmission cooler integrated on the left-hand (LH) side of the radiator. To facilitate connection with the factory transmission oil cooler, the LH drain plug must be replaced with an AN6 9/16 - 18UNF threaded hose fitting. It is essential to verify the inner diameter of the radiator-to-transmission oil cooler regulator valve hose to ensure the correct hose fitting size is utilized.

BMW E39 540i Automatic Transmission Oil Cooler up to 09/1998 BMW E39 540i Automatic Transmission Oil Cooler after/post 09/1998

Features

• 2-Row 42mm Core (Dual Core) Featuring CSF's Exclusive B-Tube Technology
• Core Features an Ultra-Efficient Fin with 6.5mm Fin Height and Multi-Louvered Design for Maximum Surface Area Contact
• CNC Machined "Quick-Connect" Inlet/Outlet Connections
• CNC Machined Brackets and Fittings for Superb Fit and Durability

Unless explicitly stated otherwise, all products sold by R44 Performance Limited are designated RACE ONLY and are solely for competition or off-road use limited to racing formally sanctioned by a recognized racing organization. Any other use, including recreational off-road use, may violate local, state, and Federal laws. R44 Performance Limited does not implicitly or explicitly confirm the legality of using any products it sells on public roads; that is entirely the responsibility of the consumer.

It is the responsibility of the customer to check with all federal, state local and environmental laws before ordering and installing a product. R44 Performance Limited is not responsible for any fees, fines or costs that a customer may incur as a result of failing to check with federal, state, local or environmental laws before ordering and installing a product.

We get a large number of custom orders and requests everyday, so as a result it is not always possible for us to keep every item in stock at all times in our warehouse. If you require the item urgently please contact our sales team here to check the stock before you make your purchase.

We totally understand if you're not certain a part will be compatible with your car, so we highly recommend contacting us here with your query. Our friendly sales team will then be in touch to confirm if this part is the correct part you are looking for.

All in stock products ship the same day if ordered before 2pm GMT

For out of stock items we will contact you with an estimated wait time if not otherwise specified above.

We offer worldwide shipping on all products. If upon receiving your product you wish to return; we offer a 30-day returns policy. For our in-depth returns information please follow the link. "R44 Returns Policy

All of our products come with a standard warranty of 1-3 years. This is dependant on the type of product however. For more details please see our warranty page here.