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 to a crawl and is overall an unpleasant experience. Old vehicles without these safeties built in can experience major engine damage if oil temperatures get too high. In any case, overheating engine oil is a bad thing, so why not do the most you can to keep them in check and don't let something like this spoil you fun or ruin your vehicle.