The standard focus with the 2.0 non turbo engine specs 5W20. The 2.0T in the ST calls for 5W30/0W30. You're not going to damage the engine immediately on fresh 5W20, but I wouldn't run it for very longcouple thousand miles at most. The 2.0T is known for putting gas in the oil, so it needs the increased viscosity for extended change intervals.
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