CSF 8145 BMW N55 Oil Cooler / Oil Radiator Upgrade Kit – High-Performance Direct-Fit Heat Exchanger, Drop-In Plug & Play (F20 F21 F22 F23 F30 F31 F32 F33 F34 F36) – Fits M135i M235i 335i 435i – Replaces OEM 17217618360 – Trackday/Race Cooling Upgrade

CSF 8145 Uprated Oil Radiator for BMW F-Series N55 – Race-bred, plug-and-play cooling solution

Beat heat soak and protect your turbocharged straight-six with the CSF 8145 high-efficiency oil heat exchanger. If you push your M135i, M235i, 335i or 435i on fast road or trackdays, you know lubricant temps can climb past 130°C under sustained load. This CSF unit is a proven, direct-replacement upgrade that consistently delivers around a 5 to 10 °C reduction in oil temperature, keeping performance stable and helping extend engine life.

We’ve installed and run this cooler on our own cars and for numerous customer builds. Feedback is excellent: cooler running, stronger consistency session after session, and confidence when driving hard in hot weather. Built by CSF Radiators and lifetime-warrantied, it is the dependable, bolt-on answer for F-series N55 heat management.

Key reasons enthusiasts choose CSF 8145

• Endurance-proven on Hittman Racing’s M235iR race car for real-world reliability
• Meaningful oil temp drop of roughly 5 to 10 °C depending on conditions
• Genuine plug-and-play fit with no cutting or trimming – replaces factory unit
• High-density, multi-louvred fin core for superior heat rejection
• Smart two-core in-series layout converted to an M2 style single-pass with a high-pressure return line for improved efficiency
• Backed by the CSF Lifetime Warranty for peace of mind

What’s in the box

• CSF high-performance oil cooler assembly
• Innovative dual-core architecture with single-pass M2 style flow path
• High-efficiency fin pack
• Direct-fit hardware for an OEM-like installation

Vehicle fitment

Designed for BMW F-series models with the N55 engine, including xDrive where noted:

• 1 Series F20 135i(x) 2011–2016
• 1 Series F21 M135i(x) 2011–2016
• 2 Series F22/F23 M235i(x) 2012–2016
• 2 Series F22/F23 M235i Racing MS BMW Sport 2012–2016
• 3 Series F30/F31 335i(x) 2011–2015
• 3 Series F34 GT 335i(x) 2012–2016
• 4 Series F32/F33/F36 435i(x) 2012–2016

If you own an N55-powered 1 Series, 2 Series, 3 Series or 4 Series in the F20, F21, F22, F23, F30, F31, F32, F33, F34 or F36 chassis, this CSF 8145 oil radiator is the direct-fit, performance-focused upgrade you want.

Part numbers and warranty

• CSF Part Number: 8145
• Direct replacement for BMW OEM: 17217618360
• Warranty: CSF Lifetime Warranty

Installation and support

Professional fitting available at MJ Modifications in Warwickshire. For a fitting quote or technical advice, email info@mjmodifications.co.uk. This is a straightforward, plug-in swap for the factory cooler.

Compatibility check

To ensure perfect fitment before dispatch, add your UK registration or the last 7 of your VIN at checkout and we will confirm compatibility.

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