CSF 8187 Auxiliary Radiator for 15-23 Mercedes C63/C63S/GT/GTS/GLE63/GLS63 AMG

Vehicle Fitment

• 2015-2023 Mercedes-Benz C63 AMG (W205, 4.0L V8 M177 Bi-Turbo, 1 per vehicle)
• 2015-2023 Mercedes-Benz C63 S AMG (W205, 4.0L V8 M177 Bi-Turbo, 2 per vehicle)
• 2016-2017 Mercedes-AMG GT S (R190, 4.0L V8 M178 Bi-Turbo, 2 per vehicle)
• 2017-2021 Mercedes-AMG GT (R190, 4.0L V8 M178 Bi-Turbo, 2 per vehicle)
• 2016-2019 Mercedes-AMG GLE63 (X292, 4.0L V8 M177 Bi-Turbo, 2 per vehicle)
• 2016-2019 Mercedes-AMG GLE63 S (X292, 4.0L V8 M177 Bi-Turbo, 2 per vehicle)
• 2017-2019 Mercedes-AMG GLS63 (X292, 4.0L V8 M177 Bi-Turbo, 2 per vehicle)

Fitment Notes

• Fits both left and right side positions for vehicles requiring dual auxiliary radiators
• C63 models (non-S) require only 1 radiator, while C63 S models require 2 radiators
• All GT, GLE63, and GLS63 models require 2 radiators (left and right)
• C63 models with 20-inch or larger wheels may require minor trimming of plastic shroud
• Purchase quantity of 2 recommended for vehicles equipped with dual auxiliary radiators from factory

Features

• 2-row high-performance core with CSF's proprietary B-Tube technology
• Double the capacity of OEM radiator (42mm core vs. 26mm OEM)
• Ultra-efficient 6.5mm tall fins with multi-louvered design
• 100% TIG-welded all-aluminum construction for maximum durability
• CNC machined mounting brackets for precise fitment
• OEM-style quick-connect inlet and outlet fittings
• Detachable rock guard for debris protection
• True drop-in fit requiring no modifications
• Individually leak and pressure tested before shipment
• 1-hour mirror finish hand polish available

Specifications

• Position: Front auxiliary (left and/or right side)
• Core Type: 2-row aluminum with B-Tube technology
• Core Thickness: 42mm (62% thicker than 26mm OEM)
• Fin Height: 6.5mm with multi-louvered design
• Construction: 100% TIG-welded aluminum
• Connection Type: OEM-style quick-connect fittings
• Mounting: CNC machined brackets
• Finish: Black powder coat
• Weight: 10 lbs per radiator
• OEM Part Number: Mercedes-Benz 099-500-59-03
• Installation: Drop-in fit, no modifications required
• Warranty: 2 years limited

Included Components

• 1x CSF high-performance aluminum auxiliary radiator
• 1x Set of CNC machined mounting brackets
• 1x Detachable rock guard (pre-installed)
• 1x OEM-style quick-connect inlet fitting
• 1x OEM-style quick-connect outlet fitting

Product Description

The CSF 8187 high-performance aluminum auxiliary radiator represents a significant cooling upgrade for Mercedes-AMG C63, GT, GLE63, and GLS63 models equipped with the powerful M177 and M178 twin-turbo V8 engines. Unlike standard replacement radiators, this auxiliary unit features CSF's exclusive B-Tube technology with a 42mm 2-row core that provides approximately 100% more cooling capacity than the factory 26mm OEM radiator. This increased capacity is critical for preventing heat soak during aggressive driving, track use, or high-performance modifications where thermal management becomes a limiting factor.

Auxiliary radiators in these AMG models serve a dual purpose beyond standard engine cooling. They function as the primary heat exchange medium for the air-to-water intercooler system that cools intake air temperatures from the turbochargers. Lower intake air temperatures result in denser air entering the combustion chamber, which directly translates to more power, better throttle response, and reduced risk of detonation. The CSF 8187's ultra-efficient 6.5mm tall fins with multi-louvered design maximize surface area contact and heat dissipation, while the B-Tube technology increases heat transfer efficiency by approximately 15% over conventional oval tubes through its unique brazed center seam design.

Engineered as a true drop-in replacement, the CSF 8187 requires absolutely no modifications for installation. CNC machined mounting brackets ensure precise alignment with factory mounting points, while OEM-style quick-connect fittings mate directly to existing coolant lines. The included detachable rock guard provides superior protection against debris and core damage compared to vulnerable OEM units. Each radiator is individually leak and pressure tested, then finished with durable black powder coating for corrosion resistance and stealth appearance behind the grille. For vehicles requiring dual auxiliary radiators (C63 S, all GT, GLE63, and GLS63 models), CSF recommends replacing both left and right units simultaneously for balanced cooling performance and maximum thermal protection during high-demand driving conditions.