DeutschTuning proudly offers CSF Race-Spec N55 Oil Cooler BMW 11-16. BMW N55 CSF Oil Cooler is an innovative 2-core in-series design. It is converted to a single-pass design with high pressure return line for optional flow. Secondary in-series backside cooler has an additional 5 rows of cooling for a 40 Percent increase in heat rejection.CSF's Oil Cooler is World's 1st and only true "plug-and-play" upgraded engine oil cooler for the BMW N55 engine. Its "Drop-in fit" feature requires no modification to install. It accepts all attaching OEM components including oil-line connections, mounting brackets and shroud/ducting. Made with CSF's AC condenser technology using a 1-row super-high pressure 26mm multi-channel microtube. High-density multi-louvered fin design for maximum surface area contact. Track tested and proven by Hittman Racing's M235iR endurance race car