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The 2018 Ford Focus ST is equipped with a 2.0L 4-cylinder engine that requires either 5W-30 Synthetic Motor Oil in temperatures above -20°F or 0W-30 in temperatures below -22°F. The vehicle's oil capacity is 5.7 quarts with a filter, and the torque specification for the drain plug is 20 ft/lbs. Synthetic oil, unlike conventional oil, is artificially created using chemical compounds and has fewer impurities. It is crucial to use oil to maintain a clean engine and properly lubricate its components. However, oil needs to be changed periodically as it degrades over time. For the Focus ST, it is recommended to change the oil and filter every 3,000 to 5,000 miles.
For optimal performance, it is recommended to use synthetic motor oil with a viscosity rating of SAE 5W-30 for the 2019 Ford Focus ST.
I've been using synthetic oil since I bought the car, even though the recommended oil type is 5w20.