Mishimoto 13+ Ford Focus ST Thermostatic Oil Cooler Kit - Black"Turbocharged, high stress 4 cylinder engines like the 2. 0L EcoBoost engine in the Focus ST can overheat their oil very quickly within a few laps on the track or aggressive street driving. Even with the stock liquid liquid head exchanger, the engine can still run very hot and run the risk of overheating the engine's coolant as well. Aggressive tunes and some track miles can significantly overheat your oil wear down your engine. Leave it to Mishimoto