CSF Hydraulic Power Steering (PAS) Oil Cooler for BMW M3 E90 E92 E93 (E9X) S65, 2007-2013 - Direct-Fit Dual-Pass 6-Row Steering Fluid Radiator/Heat Exchanger, Track Day Ready, Bolt-On, Supercharger Compatible

Track-proven steering fluid cooling for BMW E90, E92 and E93 M3 S65

Drive your V8 M3 harder and longer with CSF’s drop-in steering fluid cooler. This direct replacement steering system heat exchanger keeps hydraulic assist temperatures under control on fast road and circuit work, delivering rock-solid steering feel when the factory unit starts to struggle. Ideal for E9X owners chasing reliability with sticky tyres, repeated hot laps and forced induction builds.

CSF’s motorsport-inspired core features a six row, dual pass layout that unlocks serious thermal headroom. Compared with the OEM piece, you get an 83 percent increase in exposed surface area and lab-tested gains showing up to 40 percent higher efficiency. The controlled-atmosphere brazed construction is built for repeated heat cycles, aggressive driving and year-round use in the UK and beyond.

Why enthusiasts choose this steering fluid cooler

• Six row dual pass performance core for rapid heat rejection
• 83 percent more surface area than the factory unit for stronger cooling capacity
• Up to 40 percent more efficient than OEM in independent laboratory testing
• CAB brazed core for excellent durability under sustained track temperatures
• Direct replacement in the OE location, no cutting, factory-style fit and finish
• Clears popular supercharger hardware on the S65 V8 without compromise
• Consistent steering assist on fast road, track day, time attack and drift sessions

Fitment and compatibility

BMW M3 E90, E92 and E93 with the S65 V8, model years 2007 to 2013. Designed as a plug-in, bolt-on upgrade using the standard mounting points and line routing. Compatible with aftermarket forced induction setups on the S65 platform.

Real results

We have fitted and run this CSF steering fluid cooler on our own builds and many customer cars. Feedback is consistently positive, with reduced fluid temperatures, stable steering weight during long sessions and better confidence on track. It is a high value reliability upgrade that protects the rack, pump and PAS fluid when you are pushing on.

Perfect for performance driving

Whether you are experiencing steering fade after a few hot laps, building a supercharged E92, or simply want a preventative cooling upgrade for your daily-driven E90 or convertible E93, this drop-in steering oil cooler is a must-have. It is the simple way to keep hydraulic assist temperatures in check and maintain that precise M3 steering feel.

Installation and support

Professional fitting is recommended. MJ Modifications offers in-house installation in Warwickshire. To request a fitting quote or to discuss your M3 cooling package, email info@mjmodifications.co.uk.

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