CSF Race BMW E9x M3 race-spec DCT/6speed Transmission oil cooler, BMW E90 engine oil cooler. Made 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 vs. OEM 10 tube design. High-density multi-louvered fin design with 20% more surface area contact compared to OEM unit.