CSF Racing Oil Cooler (BMW M3 E90 E92)BMW M3 E90 E92 CSF Racing Oil Cooler Kit The engineers over at CSF know cooling. So when it comes to keeping your engine oil temps down as you push your E9X M3 hard on the street or track, a CSF Oil Cooler is the obvious choice. Engine oil temperatures are a big concern to anyone who tracks their vehicle or pushes it hard on hot days. High oil temperatures in modern cars will send you into "Limp Mode" in order to protect the engine but slows you down