CSF 99-03 BMW M5 (E39) / 95-03 BMW 540i M/T Radiator (Fits Auto Trans w/Modified Drain Plug)

The CSF 7064 radiator is built with CSF's exclusive B-Tube Technology, a unique design that uses specially formed tubes with a seam brazed seal. This construction is stronger than standard oval tubes and increases the heat transfer surface area by about 15%, allowing for dual liquid laminar flow and better cooling efficiency. It's a solid choice for your 1999-2003 BMW 540i, especially if you're pushing the engine harder or looking for improved performance.

This radiator features a 2-row, 42mm core with multi-louvered fins that are precisely aligned to maximize airflow and heat rejection. CSF has over 50 years of experience making radiators, and they test their designs in wind tunnels to ensure top performance. The CNC machined brackets and fittings ensure a precise fit, and it's designed as a direct replacement, meaning it accepts all your original attaching components like hoses, the AC condenser, and fan shroud. This makes installation straightforward, without needing any modifications to your vehicle.

While this radiator is designed for manual transmission models, it can also fit automatic transmission vehicles with a modified drain plug. You can reuse your original hoses and mounting hardware, simplifying the swap. If you're looking to keep your E39 running cool, whether for daily driving or more demanding use, this all-aluminum radiator from CSF is a well-built option.