DeutschTuning proudly offers CSF Race BMW E46 M3 race-spec Dual-pass Oil Cooler. CSF, The Cooling Experts, have been serving the US aftermarket for almost 4 decades. With over 30 million units sold, CSF is your exclusive source for Radiators, Condensers, Intercoolers, Inverter Coolers, Racing Radiators and Pressure Caps.BMW E46 M3 race-spec Dual-pass oil cooler