RENNtech-CSF Radiator for R129 600SL/SL600

RENNtech-CSF Radiator for R129 600SL/SL600

The V12 R129 is now more than 25 years old and at that age, plastic components begin to fail - the radiator is one of them.

RENNtech partnered with CSF to deliver not just a permanent fix, but an upgrade.

The exclusive RENNtech X CSF High-Performance Radiator is a direct-fit cooling upgrade for Mercedes-Benz R129 V12 models, engineered to improve thermal efficiency, durability, and cooling capacity without compromising factory fitment or appearance.

Featuring a 42mm 2-row high-performance core, and 6.5mm multi-louvered fins, our radiator delivers an estimated 15–20% increase in heat-transfer efficiency compared with the OE design. The larger, more efficient fin structure improves airflow, heat rejection, and temperature recovery during high ambient temperatures, extended idling, and demanding driving conditions.

Unlike the factory radiator’s aluminum core and crimped plastic end tanks, the RENNtech X CSF upgrade uses 100% TIG-welded aluminum for increased strength and long-term durability. This construction eliminates common age-related weak points, including the factory plastic overflow connection.

A built-in 5-plate transmission oil cooler, CNC-machined mounting brackets, and OEM-style inlet and outlet connections ensure true plug-and-play installation using the factory fan, shroud, and mounting points.

Designed for the M120 V12, the radiator provides additional cooling reserve for standard 6.0L engines as well as higher-output AMG and RENNtech 7.4L, 7.5L and 7.6L configurations.

Key Features

• 42mm 2-Row Ultra-High-Performance Core
• OEM-style inlet and outlet connections 
• Direct drop-in installation with no modifications
• 15–20% improved heat-transfer efficiency
• 6.5mm multi-louvered high-efficiency fins
• 100% TIG-welded aluminum construction
• Integrated 5-plate transmission oil cooler
• CNC-machined mounting brackets
• Satin black end tanks with natural aluminum core
• Individually leak- and pressure-tested
• Replaces Mercedes-Benz OE part 129-500-10-03

Fits

1991-2002 600SL/ SL600/ SL70/ SL73/ RENNtech SL74/ RENNtech SL75/ RENNtech SL76