CSF BMW M3 E46 Dual Pass Race Spec Oil Cooler

The E46 M3 comes with a factory oil cooler, but it simply wasn't designed for genuine high-performance driving - a few minutes on track quickly reveals how inadequate the stock unit really is. Dangerously high oil temperatures accelerate oil breakdown and put the S54 at real risk of internal damage, which is exactly the problem this cooler was engineered to solve.

The new core is over twice the size of the factory unit 243 cubic inches of volume versus the OEM's 103 cubic inches - replacing the factory's single-pass design and plastic shroud with a unique top/bottom dual-pass configuration for genuinely maximised surface area and flow. A turbulated, heavy-duty bar/plate design delivers 8 rows of maximum cooling with a high-density, multi-louvered fin pitch, while fully TIG-welded extruded end tanks replace the OEM's weaker mechanically-jointed and tack-welded construction for real reliability and durability gains. The tapered shape fits precisely within the contour of the OEM bumper, so there's no conflict with aftermarket splitter attachments either.

Why Choose This Oil Cooler

• Over 2x the volume of the factory unit - 243 cubic inches vs the OEM's 103 cubic inches
• Top/bottom dual-pass design - maximised surface area and flow versus the factory single-pass layout
• Turbulated heavy-duty bar/plate construction - 8 rows of maximum cooling with high-density fin pitch
• Fully TIG-welded extruded end tanks - genuine reliability upgrade over the OEM's tack-welded design
• Fits the OEM bumper contour precisely - no conflict with aftermarket splitters
• Track proven - developed specifically to address the factory unit's known shortcomings under hard use

Compatibility

• BMW E46 M3 (2000-2006, S54)