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Turbocharged, high stress 4 cylinder engines like the 1.6L EcoBoost engine in the Fiesta ST can overheat their oil very quickly within a few laps on the track or aggressive street driving. Even with the stock liquid-to- liquid heat 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 and wear down your engine. Leave it to Mishimoto to come up with an oil cooling solution for your Fiesta ST! Mishimoto engineers started with a large 19-row oil cooler and mounted it in the front of the vehicle where it receives the most airflow.