CSF Race-Spec Oil / DCT Cooler – BMW 335i / X1 35i (E-Chassis, N55)

OVERVIEW

CSF's #8042 dual-pass cooler replaces the factory oil/transmission cooler on the N55-powered E9x 335i and E84 X1 xDrive35i. It is built with CSF's AC condenser technology around a 1-row super-high-pressure 22mm wide 11-channel microtube, giving a dual-pass core with 11 cooling tubes against the OEM's 10-tube single-pass design.

The high-density multi-louvered fin adds 20% more surface area contact than the factory unit, and the cooler lab tests around 30% more efficient than OEM. It is a drop-in fit that accepts every OEM attaching component — oil-line connections, mounting brackets and shroud/ducting. On DCT and automatic cars it serves as the transmission cooler; on 6-speed manual cars the same unit is the engine oil cooler.

SPECS

• Built with CSF's AC condenser technology using a 1-row super-high-pressure 22mm wide 11-channel microtube
• Dual-pass high-performance core with 11 cooling tubes versus the OEM 10-tube design
• High-density multi-louvered fin design with 20% more surface area contact than the OEM unit
• Lab tested at approximately 30% more efficient than the OEM cooler
• Serves as the transmission oil cooler on DCT/automatic cars and the engine oil cooler on 6-speed manual cars
• Drop-in fit requiring no modifications — accepts all attaching OEM components including oil-line connections, mounting brackets and shroud/ducting
• Replaces OEM part number 17227521376
• 2-year warranty to the original purchaser under normal use

PARTS INCLUDED

• CSF #8042 dual-pass oil / transmission cooler
• Complete kit as supplied by CSF Radiators; see the installation instructions for the full bill of materials

TECH RESOURCES

Additional Parts Required

• None. CSF Radiators specifies no additional hardware for this part — it is a drop-in fit that reuses the OEM oil lines, brackets and ducting.
• Installer-supplied: a drain pan and fresh fluid to replace what is lost when the cooler and lines are opened.

Installation

• CSF does not publish a downloadable installation PDF for this part. Printed installation instructions ship in the box.

Notes

• DCT/automatic cars run this unit as the transmission cooler; 6-speed manual cars run the same part as the engine oil cooler.
• N54 car? See CSF Race-Spec Oil / DCT Cooler – BMW 335i / 335is (N54). E9x M3? See CSF Dual-Pass DCT / Oil Cooler – BMW M3 (E9x, S65). Same CSF part, listed by engine.
• CSF does not list the E91 Touring, E93 Convertible or E8x 135i for #8042 — confirm those with Speed Logic before ordering.

PART NUMBER

• 8042

VEHICLE APPLICATIONS