Oil is the lifeblood of any vehicle. Its lubrication properties keep all the metal bits inside of the engine from shredding each other to dust. While the M3 and M4 rise above just about every other run-of-the-mill commuter car, nothing knocks them down a few pegs quite like overheated oil or oil that finds its way out of the system.
The M3 is all about balance, as we went over in our intro post. For that reason, the engineers at BMW incorporated their own thermostatic oil cooler system on the front of the M3. The idea is to keep the oil at the optimal temperature during a commute to work, or if you decide to drive past the office and directly to the track