Radiator for Mercedes Benz SLK-Class SLK280 SLK350 (2005-2008) 3.0L 3.5L

High-Efficiency 3-Row All-Aluminum Radiator for 2005-2008 Mercedes Benz SLK-Class (R171)

What it Does: The all-aluminum 3-row performance radiator replaces the failure-prone factory heat exchanger on the 2005-2008 SLK-Class to maximize core thermal dissipation and prevent coolant loss under spirited driving.

The Stock Mercedes Benz SLK-Class Cooling Vulnerability

Factory cooling systems on the R171 chassis rely on crimped, composite plastic end tanks bonded to a lightweight, single-row aluminum core. Over operational cycles, the thermal expansion and contraction from the M272 naturally aspirated V6 degrade the plastic tank structure. Heat-cycled PA66 plastic embrittles, resulting in hairline fissures at the radiator inlet and outlet necks. Simultaneously, the crimped elastomer perimeter gaskets harden, introducing pressurized fluid leaks and catastrophic coolant loss that risks cylinder head warpage under sustained load.

The Engineering Solution

Engineered as a drop-in replacement, this heavy-duty cooling assembly features a high-density, furnace-brazed 3-row aluminum tube-and-fin core that increases fluid capacity and convective heat transfer surface area. The failure-prone plastic tanks are replaced by laser-cut, TIG-welded aluminum end tanks designed to endure high operating pressures without deforming. Precision-machined inlet and outlet ports ensure leak-free coupling to factory quick-connect hoses, actively counteracting thermal saturation and heat soak in tight roadster engine bays.

What's Included

• 1 x 3-row all-aluminum direct-fit performance radiator
• Protective transport caps on coolant ports

Technical Specifications

Compatibility

• 2006-2008 Mercedes-Benz SLK280 3.0L V6 (R171)
• 2005-2008 Mercedes-Benz SLK350 3.5L V6 (R171)

Frequently Asked Questions & Fitment Warnings

Does this fit the R171 SLK-Class?

Yes, this is a direct fit for the 2005-2008 Mercedes Benz SLK-Class equipped with the M272 3.0L and 3.5L V6 engines; it does not fit the supercharged 1.8L four-cylinder SLK200 or the V8-powered SLK55 AMG.

Do I need to bleed the cooling system after installation?

Yes, full vacuum bleeding is required during coolant refill to eliminate air pockets from the reverse-flow M272 cylinder head water jackets.

The Mercedes Benz Precision Standard

Maintain European sports car reliability with precision-welded cooling components manufactured to tight tolerances, ensuring zero warning lights, zero fitment modifications, and consistent operating temperatures under demanding thermal conditions.